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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actual load method
additional dialing
adjudicatory authority
anti-dumping duty
antihypotensives
apdi
autoladle furnace
auxiliary equiptment
birthed
bodies of the pancreas
boundary maximum and minimum
bow echo
brabender amylograph
bring a storm about someone's ear
Broad Liquidity
bucket teeth
byoir
centre of solid sphere
clearie
cold working tool steel
cold-blooded murder
Cone Heads
constant equllibrium
crank pin bearing
dane fixation
elissa
emphatic morpheme
fasification
frogleg winding
garden rocket oil
genus Brya
genus Heliothis
geometric probability
GNMA
hand-operated gun
ideal cultural pattern
iliotibial ligament of maissiat
inquiring officer
inspirer
internal mammary artery
Island Grove
isodrosothem
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