时间:2019-02-09 作者:英语课 分类:英语听力精选进阶版


英语课

Now, have you ever wondered why koalas hug trees? And apparently 1, according to a new scientific study it is to stay cool. That discovery was made by researchers from the University of Melbourne who were looking at how koalas regulate their body temperature.


And one of my students Natalie Briscoe, her PHD was focused on this question in terms of the koala. And one of the questions we want to ask about the koala is, do they use behavior at all to regulate their temperature, are they able to choose places in their trees that make them a bit more comfortable.


And how did you go about finding this out?


Well, initially 2 we went about this by putting a little weather station on a very long pole and lifting that weather station right up next to the koalas that we had radio transmitters on, and at the same time going around to other random 3 places in their habitat and measuring the conditions in the trees of those locations. But what Natalie noticed was that the koalas in the hot weather would come down and will go to the thicker trunks. And they would flop 4 onto those trunks and drop them limbs there. And we couldn't quite understand why they were doing that, but she also sought to measure the tree trunk temperatures and we found that they are actually quite a bit cool than the air. And then we took a special kind of camera that takes pictures of heat and tells us the temperature of every service in the picture. And it was so obvious once we got those pictures back. What the koalas were doing? They were putting their bottoms into the trees and dumping all their excess heating to the tree.


And were you surprised by what you found because it's known or presumably zoologists 5 know that the fur on the stomach of the koalas is a lot thinner than it is elsewhere.


Yeah, well, we knew that and we thought, well, maybe they, I guess one idea was that they just expose that during the hot weather so that heat comes out their chests into the air. What we didn't realize was how much cooler the tree trunks were than the air temperature.


That wasn't obvious to us. It was obvious when we looked at the trees with the special camera, but it wasn't before that. And then it made a whole lot of sense. And it's really surprised a lot of biologists.


And it's always eucalyptus 6 trees, is it?


No, it's not. And not all eucalyptus trees is good as each other for this purpose, so we measure a whole, a few different species of eucalypts in their habitat where we did the study and also another kind of tree called acacia. And it turned out that the acacia was actually the best one. But they don't eat the leaves of the acacia trees, they only eat the leaves of the eucalypt trees.



adv.显然地;表面上,似乎
  • An apparently blind alley leads suddenly into an open space.山穷水尽,豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
adv.最初,开始
  • The ban was initially opposed by the US.这一禁令首先遭到美国的反对。
  • Feathers initially developed from insect scales.羽毛最初由昆虫的翅瓣演化而来。
adj.随机的;任意的;n.偶然的(或随便的)行动
  • The list is arranged in a random order.名单排列不分先后。
  • On random inspection the meat was found to be bad.经抽查,发现肉变质了。
n.失败(者),扑通一声;vi.笨重地行动,沉重地落下
  • The fish gave a flop and landed back in the water.鱼扑通一声又跳回水里。
  • The marketing campaign was a flop.The product didn't sell.市场宣传彻底失败,产品卖不出去。
动物学家( zoologist的名词复数 )
  • Zoologists refer barnacles to Crustanceans. 动物学家把螺蛳归入甲壳类。
  • It is now a source of growing interest for chemists and zoologists as well. 它现在也是化学家和动物学家愈感兴趣的一个所在。
n.桉树,桉属植物
  • Eucalyptus oil is good for easing muscular aches and pains.桉树油可以很好地缓解肌肉的疼痛。
  • The birds rustled in the eucalyptus trees.鸟在桉树弄出沙沙的响声。
学英语单词
alpha-proton reaction
alpinia officinarum
alterna-
answer-back signal
archimimes
Arequipite
as like as chalk to cheese
autonomous amplitude limiter
autoregressive deconvolution
avantgardistic
benzhydryl amine
Bermudian rig
bertalanffies
biennial bearing
bitser
blue tulips
Booth, Edwin (Thomas)
brass instrument
bus-fare
casting surface
cherogrils
Chinese lexicology
CORDAT
craplets
critical melting point
descended upon
DIS/SEC
ephedine
epidermolysis acquisita
ethenylene
Ferospace
fibre optic memory
film disk
floating sludge
flobber
fluorocomplex
free-response
gamed
gastrostyle
good wishes
Gr. S.
gradient projection method
graduates
hemochromatosis
hunting-cat
hydroxy-malonic acid
hyperboloidal mirror
industrially advanced country
Kirovskaya
Lytton, Edward George Earle Lytton Bulwer-,lst Baron Lytton
manograph
Mansonia annulatus
mid ordinate
miediling
modulation formats
native vermilion
onerari non debet
orizio
part-time bowler
peltate tentacle
pigeonhole principle
point-contact
polychromism
postboat
preemulsion
primary tentacle
promote the sale of products
Pueblan
rail loading machine
renal fibroid sarcoma
rescue cutter
rich chromium ball bearing steel wire
rio bravoes
rogueish
Sarcosperma arboreum
scientific notation
search frequency generator
second reserve
signal instructions
smart structure technology
sodium dodecylsulfate
spelye
square normal closed double head wrench
steam-powers
steering engine valve
subnuclear particle
subsizar
Syringa julianae
tarsal pulvilli
text-understanding
twin-cams
unnarratable
uova
vacuum diffusion pump
valley girls
varitypers
Villiers
vinylcarbenoids
vizament
walruslike
Web Pad
withametelins