时间:2018-12-24 作者:英语课 分类:Scientific American(十)月


英语课

 Pet turtles can be unsanitary. But Chinese soft-shelled turtles really up the ante on distasteful behavior. They perform a variation on urination—through their mouths.


 
Most land-based vertebrates produce urine to get rid of water-soluble toxic 1 waste, notably 2 nitrogen-containing urea. But researchers found that Chinese soft-shelled turtles get rid of just six percent of their urea through the kidneys. They also discovered a high concentration of urea in the turtles' saliva 3. Which led them to one place: the mouth.
 
Fish can remove waste through their gills, and these air-breathing turtles have gill-like structures in their mouths. Further research showed that they also have a urea-transporting protein that helps them get rid of it. The findings are in the Journal of Experimental Biology. 
 
When the turtles aren't able to go for long swims, they were seen spending well over an hour with their heads submerged in puddles 4. Apparently 5 they were releasing the urea and cleaning out their mouths. And maybe just looking for a little privacy.

1 toxic
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。
2 notably
adv.值得注意地,显著地,尤其地,特别地
  • Many students were absent,notably the monitor.许多学生缺席,特别是连班长也没来。
  • A notably short,silver-haired man,he plays basketball with his staff several times a week.他个子明显较为矮小,一头银发,每周都会和他的员工一起打几次篮球。
3 saliva
n.唾液,口水
  • He wiped a dribble of saliva from his chin.他擦掉了下巴上的几滴口水。
  • Saliva dribbled from the baby's mouth.唾液从婴儿的嘴里流了出来。
4 puddles
n.水坑, (尤指道路上的)雨水坑( puddle的名词复数 )
  • The puddles had coalesced into a small stream. 地面上水洼子里的水汇流成了一条小溪。
  • The road was filled with puddles from the rain. 雨后路面到处是一坑坑的积水。 来自《简明英汉词典》
5 apparently
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。
学英语单词
5,6-benzoquinoline
aidomyia femoralis
air pamp
anti-frction
antioxidizing and antigum agent
apparent threshold
Baia-Mare
banking data base
bastids
befuddlement
Bugarama
building expense
career-driven
characteristic homology class
chronocyclegraph
conjugal ligament
coronaster sakuranus
coverage area of radio navigation system
cubulation
deglutathionylation
demonographers
disposal of oil
engineering materials
English high court
enterprises run with foreign capital
entotrochanter
equisubstantial
escons
event-driven
FOCUS Fusion
fuel solution reactor
fundamental conjecture
gas pedal
geodiversity
goosewings
Gopichettipālayam
Gushan District
harmfuller
haulage box
heliolatry
Heredopathy
holoacrania
honorary secretary
hydroponic greenhouse
hydropsyche orbiculata
hypothalamic factor
Itousanseng
Lagrangian functions
lease charges
load-carrying members
locally ringed space
Mastigamoeba
maturity profile
MaxFileFragments
mealler
memory and device control unit
merchantabilities
monitoring project
non-united
noncognate
okloes
okra plant
omphalotus illudenss
optical pulse counter
ortho-nitraniline
ortolan bunting
overpush
Pedro Leopoldo
Pekanbaru
pointer variable qualification
pooching
posterior ampullary nerve
premature puberty
printer control instruction
propellant loading temperature
protomyces inouyei
Quesnelia
regardlessly
repulped stock
risk-taking
rope yard
runtocompletion
sabbatical leaves
serial bus
shin
siderometeorite
states school
striascope
su y?eh
sweptfrequency
TALD
TGN38
TNC
tournado
tupmen
Ust'-Uda
vaginal smear
varistor rectifier
vertical milling attachment
watch-quench tank
wind breakage
woldt