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 beam in sb.'s own eye
anticyclonicity
Asquith
Ban Houay
beuys
blood group examination
Charleroi
check-valve lever
cirrostratus clouds
coarcting
conglomeratize
coprohematology
credit in account
Cryptocerata
culminate
cytotrophoblastic cell column
dark-sides
deterministic grammar
direct yield
disc polar planimeter
discount income
DRN
Dyer drive
electron scanning
eluvial soil
embassy suites
end fent
erything
ext.
eye storage characteristic
feature definition
Firminópolis
Fiskdale
genus liatriss
grid-type ion source
hindered alpha decay
hindlongs
humification
In my bad books
inorganic physical chemistry
instrument board dial glass
interbrews
karl von frisches
Keith, Sir Arthur
Las Petas
learning curves
lhg
lichen syphiliticus
like a headless chicken
linearizes
loess like rock
maize drill
Masculine sapphire
Mauri, R.
mechanical monochromater
mechanism of toxication
molecular system of heredity
motor cargo boat light
ngp
nickel-iron-alkaline cell
non-notice audit
nose-blowings
Ocna Sibiului
one-step prediction
packed in
phreniconeurectomy
plate carrier
play down to someone
pocket piece
poonas
professional register
project authority
prosimians
public governance
rear-rib
return pole
ribbed canal
rotating wire rope
sawn-off wild-deer antler
screechings
shavehooks
short-distance transmission
sick joke
single-handedly
soccer goal
Strelcha
subungulata
sulphoximines
System International
take a farewell of
thoro-
thrashest
tidy sum
Tiglath-pileser II
total strain
tweedling
two-colour radiation thermometer
USB tracking telemetering and control system
vice table caisson
volland
wash barrel
wolf pups