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
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anemogram
apparent bulk density
ash cellar
aurichloride
autoregressive process of order p
back panel
back to back connection
bonae
bottom planking
cable splicing box
campaign plan
cantello
chiquimula
cis-Diamminedichloroplatinum
classical Marxism
closed-cycle iodine laser
communication set
concrete batcher
cover assembly
cyclobenzaprines
decanoates
desensationalizes
destructive read
digital health
dillworth
diversion ditch
effective inertia-mass
engineer superintendent
faolain
flag paving
flashless molding
Gatruyeh
good timber
Grandmaster Flash and the Furious Five
Great Khingan Mountains
Green I.
heat-seeking guidance system
heterogenies
hyperendemicity
inferior grade
jobhunt
journal-keeping
Kitzingen
Leptinus
line singularity
mafenide
marine zoogenetics
Martyrdom of Polycarp
micro-chips
mitla
mortgage liability
motion frequency
nicofort
object height
on line charge
one'a
Orinoastraea
oxy-clean
penetrated crack
pipe expansion force
pleurotergite
Pormylgitoxin
present worth of annuity
presidenta
price sensitivity
priority interrupt expander
prostanoic acid
pseudomorph by alteration
puncture strength
Pusteria, V.(Pustertal)
reachability tree
rectilinearities
reduced force
resolution-enhancement
revester
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sealed cover
select bar
self-registering gauge
semimodal
sincodex
split timber
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stabstitch
tela corticalis
teracoulombs
tetrahedral coordination site
theory of risk-bearing
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thin wall part
three K's
topological map
treatment line
truck-mounted generator
TSMC
uphs
valve spring cap
vestibular area
weidenthal
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