时间:2018-12-24 作者:英语课 分类:Scientific American(七)月


英语课

The earth’s tropics teem 1 with species. They’re far more biologically diverse than the cooler parts of the planet. And scientists have credited higher temperatures and greater amounts of sunlight. But a new study claims that the secret to tropical biodiversity isn’t necessarily high temperatures—it’s the steadiness of those temperatures the whole year ‘round.


When today’s biodiversity was taking shape millions of years ago, seasons as we know them didn’t really exist. So temperatures all over the planet were much more consistent than they are today, even in regions where the temps were low.


Researchers looked at insect diversity today at the temperate 2 Harvard Forest in Massachusetts, in tropical Costa Rica and in the 53-million-year-old McAbee fossil bed in British Columbia. Which back then was steadily 3 temperate. And ancient Canadian insect diversity was much more similar to modern Costa Rica’s than to the Harvard Forest’s. The work appears in the journal Paleobiology.


So we may have been thinking backwards—it’s not that the tropics have greater biodiversity. Could be that the seasons of today’s temperate zones have diminished the biodiversity that once flowered. And animaled.


Thanks for the minute for Scientific American’s 60-Second Science. I’m Steve Mirsky



1 teem
vi.(with)充满,多产
  • Good ideas teem in her head.她的头脑里好主意极多。
  • Fish teem in the Chinese waters.中国近海鱼产丰富。
2 temperate
adj.温和的,温带的,自我克制的,不过分的
  • Asia extends across the frigid,temperate and tropical zones.亚洲地跨寒、温、热三带。
  • Great Britain has a temperate climate.英国气候温和。
3 steadily
adv.稳定地;不变地;持续地
  • The scope of man's use of natural resources will steadily grow.人类利用自然资源的广度将日益扩大。
  • Our educational reform was steadily led onto the correct path.我们的教学改革慢慢上轨道了。
标签: SSS 托福听力
学英语单词
air weapons controller
analytical geometry of space
antifungal factor
antihomomorphism
ball bearing shielded
BEOP
bilge board scow
cassone
castane
chelon
Chirico, Giorgio de
civilized behavior
civitas
clett
complementary arc
concentrate fresh milk
courtlike
coveners
crosswind stability test
crown of beam
decoster
densifications
dispatch tables
Elatolite
electro-optic transmitter
Empoundment
farm sth out
fi-lb
flint corn
forsung
free oil lubricating compressor
free-verser
fruge
gapest
grism
haematogeneses
halden
hammady
human interface technology laboratory
idumean
Impatiens toxophora
implementation of the transport level
inelasticity coefficient
initial test
integrated optical spectrum analyzer
intracanaliculi
issuable
italicus
Kartarpur
lexian distributions
lymphadenovarix
memorialized
mennonitisms
mental energy
microwave source
mole skin
networked community
Nicollella
noncontaminated atmosphere
objective behavior inventory
odd electron spin
order of dimensioning
oxygen fill valve
parathyroid tetany
penetrating effect
Philippopolis
pinto bean
platform end door
protoform
publicly
pyres
refractometric analysis
return-tube boiler
rounds per shift
Saiyid Mazār
short shut-down
simple and opposite
Sovkhoznyy
static convergence correction
subdelirium
sums up
super-short
superheater flue
swallow nest
taeniarhynchosis
tear gases
terry sole
thyristor brush
transfer tensor
underscan
unhaired hide
upper window edge
valerian fluidextract
vibration proofing material
vinactane
weigh on sb
without further ado
woonerfs
woronoff ring
wrapping-up
xerophytia
zamia pumilas