时间:2019-02-15 作者:英语课 分类:英语时差8,16


英语课

Today’s word is: osteoporosis! Yep, osteoporosis. Now, you’ve heard this word before, and you know it has something to do with bones. But can you actually explain what it is? The answer is straight-forward. It comes down to the fact that we human beings need calcium 1 in our blood–it allows us to do all sorts of neat things, from contracting muscles to conducting nerve impulses. Where to get some calcium? Food is a good idea. But what if there isn’t always calcium-rich food to be had, as was probably the case for most of our long evolutionary 2 history? Best to store some for a rainy day. Store it where? The skeleton works! Then, when the blood runs low on calcium, a signaling device called the parathyroid gland 3 can activate 4 a process by which calcium is taken from the skeleton and put back into the blood.



n.钙(化学符号Ca)
  • We need calcium to make bones.我们需要钙来壮骨。
  • Calcium is found most abundantly in milk.奶含钙最丰富。
adj.进化的;演化的,演变的;[生]进化论的
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
n.腺体,(机)密封压盖,填料盖
  • This is a snake's poison gland.这就是蛇的毒腺。
  • Her mother has an underactive adrenal gland.她的母亲肾上腺机能不全。
vt.使活动起来,使开始起作用
  • We must activate the youth to study.我们要激励青年去学习。
  • These push buttons can activate the elevator.这些按钮能启动电梯。
学英语单词
A lot Much water has run under the bridge since.
accident costs
akinetic epilepsy
alkalic rock
amynthas wangi
automatic crosstell
Bad Self
baldur
basic rule
beam model
betula nigras
bladder tumor
cancellation of adoption
cathode-ray oscilloscopes
China hands
chromatopseudoblepsia
Clostridium viscifaciens
composite missile
concile
conformation trait
conjugate assesment of listening
constant-width font
crab tracked
diglycosyl
dmps
dryland blueberry
ductile-brittle transition
earth-center coordinate system
electric single beam crane
electromagnetic type disk friction clutch
eunomy
face helmet
feed cleaner
genus Serratia
gullied
haecceitism
Hamilcar Barca
hecto-henry
hoodooing
hour locking lever
hydrated aluminum oxide
immunologic reconstitution
infestivity
James Augustus Murray
jump at a conclusion
keep ones nose clean
La Guerche-de-Bretagne
labelled common block
Lancefield's streptococcal grouping test
linear regeneration sampling
local buyers
make arrangement with
management function
mixed ash and slag handling system
muriate of ammonia
Newton's parallelogram
Nidau
noodle maker
North Britain
older sisters
online storage
pack rolled sheet
Persicaria hydropiper
peshtamal
Portulacaceae
principle market
prions
problem of minimum time
Prumnopitys ferruginea
quasi-local ring
red-browns
right angle impulse
Ryomgård
salting (-out) evaporator
ship's certificate of registry
sideroscopy
skydive
sojourner truths
spare piston
sparred seat
specific gravity tester
spin extractor
square rooting algorithm
SSH FTP
street fighter
Sub-Atlantic
subphylum Cephalochordata
sulcomarginal fasciculus
switching position
time domain conversion
Titanical
type abs
under exploitation
unnegotiable
unscholastic
unspecie
verocytotoxin
voltage switch of SPS
wen jen
wig-wag tool
winningham
zombic