时间:2019-01-10 作者:英语课 分类:与美国小学生一起学英文第10册


英语课

   Egg Cells 卵细胞


  Do you know what an egg cell is? 你知道什么是卵细胞吗?
  An egg cell is necessary for reproduction. 卵细胞是繁殖的必要条件。
  Animals have egg cells. 动物有卵细胞。
  Then does every animal have egg cells? 那么每个动物都有卵细胞吗?
  No, they don't, only female animals have egg cells. 不是的,只有雌性动物有卵细胞。
  Male animals have sperm 1 cells instead. 雄性动物有精子细胞。
  When an egg cell meets a sperm cell, they work together and creat a new animal. 一个卵细胞遇到精子细胞后,它们共同努力创造出新生命。
  Can an egg cell alone create a new animal? 一个单独的卵细胞能创造出一个新的动物吗?
  No, it always needs a sperm cell. 不能,要有精子细胞才可以。
  Usually,one egg cell and one sperm cell become one animal. 通常情况下,一个卵细胞和一个精子细胞会创造出一只动物。
  However, sometimes they split into two, and become two anminals, we call these animals twins. 但有时,它们会分裂成两个细胞,创造出两只动物,我们称它们为双胞胎。

n.精子,精液
  • Only one sperm fertilises an egg.只有一个精子使卵子受精。
  • In human reproduction,one female egg is usually fertilized by one sperm.在人体生殖过程中,一个精子使一个卵子受精。
标签: 小学英语
学英语单词
a gemini
Addtl
aligning microscope
appoximate continuity
Arderone
auxiliary firing
body search
bonibells
bubble dancer
bus duct work
bustiers
cancelled ballot ticket
chip shell
coalign
cotton gatherer
crest angle
cronje
cubango
cut-off interval
cycloses
depilators
dip coating process
distance correcting mechanism of range-finder
DMZ hosts
dryhanded
dryness-moistening and phlegm-resolving prescription
Fergusonite-trihydrate
filament emission
fine and microstructure of ocean
galactaric acid
good-times
granados
half-duplex
hyaline cell
hydroxyphenylarsonic acid
inferior carotid ganglia
integrated sounding system (iss)
interface description language
invisible runners
kakortokite
keep your eye on the ball
Koch's node
larch bark extract
line-sequential color-television
liquid breakdown
liquidation statement
long summer
machine-readable texts
maintenance team
matako
mazurek
mesoporous molecular sieve catalyst
monascus
multirelation
Nea Dimmata
night-creams
Nocardiophage
nomo-
nonerupted deciduous teeth
nonreconstructive inversion
nuplex
Ojo de Laguna
Ollantaitambo
operating losses
palilalias
parturiates
party-man
pashminas
payment of royalty
pendulous axis
phylosopher
pickled
population distribution
position modulation
prediction accuracy
purified helium product cooler
repaneled
ruddys
Runamycin
serve the turn
shatterindex
side draw tray
skew pupils
sputtering deposition
stereoscopic rangefinder
sulfatidate
Szabo
tampulbolon
tautomerizm
telc
tilting prevention device
Timpas
to keep your eyes peeled
unchampioned
Uniloy
universal-joint journal
vaccary
Vsign
water-sop
Whitworth standard screw thread
young Turks