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
-therapy
acceptable malfunction rate
account-opening
alter tack
alternative media
analog-digital integrating translator
anti-labor
Arlt-Jaesche operation
autoweak
barcoes
Barre-Lieou syndrome
beg a favour of sb
biopsy needle set
broken-nosed
buddy tree
bunched up
Calci-Chew
castanospermums
changing ball
chapdelaine
charging rack
chrismons
Cisco Certified Security Professional
co-beneficiary
cundle
dendritic (accessory respiratory) organ
dew-claws
di(2-ethylhexyl) phosphate
enabled transition
errand ghosts
exencephali
fatigue quotient
fluoride pollution
fly off the shelves
formula molecular
funiculus ventralis
gastev
genus Rhodymenia
geokichla citrina
h.q
homometric
hukm
imbenignity
Immu-G
in over their head
inclined tray drier
isofagaridin
issue from sth
item by item
jeniquen
kerbing
Landet
lilis
load cumulative
Malyshevskoye
Mebichloramine
Metaeritrichium microuloides
mmm-mmm
Montana City
motion sensing
multifunction printer
neutralisms
Nong Khang
NRV (non-return valve)
Nylander's reagent
oscilloprob
P. rat. actat.
pause delay
pectus recurvatum
pin-file
polarization phenomenon
predispatch
premeds
priority bond
purse seine hauling machine
rate of deposition
real hypersphere
reference critical stress intensity factor
ringol
saddle felt
school building
sectorial rate of consumption
shore pines
side-stable relay
slightly
spiral pattern
split-pole rotary converter
stellar generator
stewed
stiff-neckedly
study center
submaxillary lymph-sac
temperature controlled package
the Backs
time study standard
total nose reconstruction
two stages of a ferroelectric shift registor
two-plate variable capacitor
ultra-thin-film capacitor
valladares
Zharëzës, Përroi i