时间:2019-01-08 作者:英语课 分类:Scientific American(十)月


英语课

Many of our medicines originate in plants. But we’re not the only ones who tap into nature.There’s increasing evidence that some animals seek out specific plants for their medicinal qualities. A new study shows that monarch 1 butterflies may be among them.


Monarch butterflies—famous for their U.S.–Mexico migration—feed on dozens of species of milkweed. Some milkweeds have a higher concentration of chemicals called cardenolides, which make the butterflies toxic 2 to predators 3. Research had focused on whether the monarc’s chose different milkweeds to hurt their enemies.


But Emory University’s Jaap de Roode wondered if the choice might be related to a parasite 4 that’s passed from mother to offspring, with fatal results: “What we do find is that the monarchs 5 prefer to lay their eggs on the medicinal species when they are infected. However, when they are not infected with the parasite, they do not prefer this species over this one, they lay their eggs equally between these two species. So somehow they know that they’re infected and they know what to do about it.” The research was published in the journal Ecology Letters.


Co-author Mark Hunter notes that watching animal choices could offer clues about what plants might contain potential medicines for us.

 



n.帝王,君主,最高统治者
  • The monarch's role is purely ceremonial.君主纯粹是个礼仪职位。
  • I think myself happier now than the greatest monarch upon earth.我觉得这个时候比世界上什么帝王都快乐。
adj.有毒的,因中毒引起的
  • The factory had accidentally released a quantity of toxic waste into the sea.这家工厂意外泄漏大量有毒废物到海中。
  • There is a risk that toxic chemicals might be blasted into the atmosphere.爆炸后有毒化学物质可能会进入大气层。
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
n.寄生虫;寄生菌;食客
  • The lazy man was a parasite on his family.那懒汉是家里的寄生虫。
  • I don't want to be a parasite.I must earn my own way in life.我不想做寄生虫,我要自己养活自己。
君主,帝王( monarch的名词复数 )
  • Monarchs ruled England for centuries. 世袭君主统治英格兰有许多世纪。
  • Serving six monarchs of his native Great Britain, he has served all men's freedom and dignity. 他在大不列颠本国为六位君王服务,也为全人类的自由和尊严服务。 来自演讲部分
标签: SSS 托福素材
学英语单词
a matter of common practice
age life method
alarming device
alpha-saphylolysin
aluminosilicate fibre
anchor rope
Annsborough
approximate absolute temperature
archontates
armature of relay
artery of the penis bulb
as-is
barnies
beadworking
board insurer
bruchuss
bulboventricular loop
calcium bentonite
capitals of italy
carbon-free stainless steel
Chijiwa
chin bristle
colour lighting
contracting officer
cumulative failure
curved isobar
Czecho-Slovakian
density of flux
diphetarsone-spiramycin
dropping vial
earth-friendly
Ecarazine
elective culture
electric resistance thermometre
fascia massetrica
fetwah
fiber communication
finite dimensional compensator
French knickers
Hishimonus sellatus
identification cards
insurance funds
jump list
knock the bottom out of
Kusan-ni
laughen
less than normal refraction
Maytenus garanbiensis
median control chart
musculi papillares septales
Nazimova, Alla
New Zealand spinaches
Newton's formula
nonconservative waste effluent
Normal-form
one who knows all the answers
organizations of the oppressed on earth
organs of hearing
overcompensate
OVTR
para-relations
pentacetylglucose
pentapetes phoenicea l.
pickup points
piquets
polyphas
polysomaty
polysulfone
Prajekan
Presbyterian Church
pulse dispersion
quotidially
radionavigation mobile station
realistic capacitor
reference to my radio
retarded fundamental solution
Rosselli-Guilenetti
rpg (radiation protection guide)
sabous
shinguard
slushy
spring off
tapered foot roller
Taxillus kaempferi
templepatricks
terminal tentacle
tetronic acid
the first reading
theopompus
thiol-modified rubber
thioltransferases
thioproperazine
train dispatching telephone
ullman reaction
unamerican
Vaala
value of the game
vendor part number
White Sunday
Whitmore
X-ray picture
Zelah