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
acellular vaccine
adelaide
ar ratawi (ratawi)
arborolatries
archecenra
arge tsunekii
assentive
axis of momentum
Bailet's sign
Band of Hope
base-level epoch
be slow on the uptake
booty bumps
catalytic combustion system
centimetre wave
charge transfer interaction
Chheuteal
Chibana
colorer hue
control file adapter
conventional gate-level simulation
Corvus frugilegus
cryolite bath
curably
cyclconic thunderstorm
Damanhūr Shubrā
defiants
dematteis
department of defense network
die channel
doubly linked circular list
earnings records
electrolytic production of magnesium
enlarged-scale
ester linkage
evaporating method
excommunicatest
expended appropriation
face miller
fineview
flumorph
guilloux
Hadsel mill
half-darks
heavy oil partial oxidation process
insect-catching leaf
internal transaction
inventrice
irisxanthone
itascas
journs
ketler
lake pigments
large-capacity
light-foodedness
nominal defendant
nondiscriminator
obligee in the mainterance
offshore berth
one-digit array
pen-lights
persing
petite yeast
pheneticillin
polynomial-time church-turing thesis
pop-tart
querier
rack type gear shaving cutter
radiate fibers
razzling
reconvence
red pill
roecliffe
running water level
Saale
service object
silent fan
single inlet impeller
skyness
sociodemographic
Stillwater County
stoker elevator conveyer
stratostat
surrenderingly
survey at stop
sxl
tenderance
timber groin
tool vendor
trelnarizine
trunk call
tuberculous mediastinal lymphnodes
tutorial subsystem
two-row velocity-stage
unitary tangent bundle
unshrank
uricogenesis
V-ring commutator
warliker
Western Electric
witch-huntings
zootechnics