时间:2018-12-27 作者:英语课 分类:英语时差8,16


英语课
Healing Elbows And Eyeballs A scratch to the surface of your eye heals quite rapidly, often in a matter of minutes. But a surface scratch on your elbow takes days rather than minutes to heal. The reason for these different rates of healing is directly linked to the kinds of cells that exist on the outer-most layers of your skin and your eyeball. When your elbow or your eyeball is scratched, a layer of cells is actually scraped away from the surface. The healing of a scratch happens when new cells take the place of the ones lost to the minor 1 injury. When the outer layer of cells on an eyeball is scratched, cellular 2 replacement 3 happens quickly because the surface of an eyeball consists of living cells. These living cells have the ability to rearrange themselves and migrate to where the cells are missing. The outer layers of skin, however, consist of non-living cells, sometimes layered three or four cells deep. These dead cells create a surface that protects the underlying 4, more tender, living cells. Because they are dead, the cells that make up the outer layer of your skin can’t move like the living cells of an eyeball. In order for new skin cells to replace old ones–in other words, in order for healing to occur–live cells, several layers below the surface, must work their way up to the outer-most layer of the skin. When compared to the quick healing that the surface cells of an eyeball can accomplish, the healing of an elbow, which must begin several cell layers below the surface, can take a long time. 

1 minor
adj.较小(少)的,较次要的;n.辅修学科;vi.辅修
  • The young actor was given a minor part in the new play.年轻的男演员在这出新戏里被分派担任一个小角色。
  • I gave him a minor share of my wealth.我把小部分财产给了他。
2 cellular
adj.移动的;细胞的,由细胞组成的
  • She has a cellular telephone in her car.她的汽车里有一部无线通讯电话机。
  • Many people use cellular materials as sensitive elements in hygrometers.很多人用蜂窝状的材料作为测量温度的传感元件。
3 replacement
n.取代,替换,交换;替代品,代用品
  • We are hard put to find a replacement for our assistant.我们很难找到一个人来代替我们的助手。
  • They put all the students through the replacement examination.他们让所有的学生参加分班考试。
4 underlying
adj.在下面的,含蓄的,潜在的
  • The underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。
  • This word has its underlying meaning.这个单词有它潜在的含义。
学英语单词
-etin
1-Hexanethiol
adult educations
Allen, Mt.
ASH,A.S.H.
balsam 1.
bantam stem
beauty pageant
budgies
built-in flexibility
bumble-puppy
card-
chthamalus challengenri
compnserve
control index
crosswise movement of saddle
CSEU
Csokonyavisonta
cumulant generating function
decimalizations
deconversion
destructing
dextrocaudad
diesel hydraulilc locomotive
distributed database definition language
dual and unified system
dykers
equivariant cobordisms
Eritrichium laxum
eukaryotic cells
extra larges
filter graph
genus Xenorhyncus
have nothing in common
hydrometer with pipette
hydroxy ethyl cellulose
incident of navigation
incrementally optimal sequence
indoor fire hydrant
isoceraunic line
ko toku gaku (japan)
kolkhozes
land station established solely for the safety of life
latiplantar
mai-baap
Malundo
marginal parameter
marital relationships
Matsukata Masayoshi
medium-pressure tyre
methylone
miako
mnium succulentum mitt.
molli
nivadensin
noncomplex
nonstick system of control
on the calendar
online-voting
optical calculation
otomyasis
paperface
Pearl River Delta
Peprothion
pharyngobranchial segment
piedraia
post-osmicate
preservation of games
Proclamation Line
product line profitability
refresher training
rhinogobius lanyuensis
sale by brand or description
security governance
self-contained program loader
shostakoviches
side-exits
Simonswald
space signal
su group
take to the streets
tandem trailers
tanganyikas
Tengchow
the lowest price
the tip of an iceberg
thing of nothing
thompson heat
transformation of element
transversity
traumatic psychosis
tricyclopentadienyl-actinium
turn separator
turnabout plow
u.p.i
UHS-I
unpartible
vanadiumism
variable impedance power meter
vassili
vatz
wither