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
access copyright collective society
all alone
antisunward
aphylactic projection
Asanonella
base wage rate
breadboarded circuit
bulgecin
bull spool
cam shaft lubricating oil tank
cancerous protuberance
Carissa grandiflora
central computer input/output
christian day school
clb method
coastered
cogollos vega
coloniale
computerized hyphenation
confirmation letter
conservation of equivalence
continued
corticovisceral
County Hall
crosses crosslet
Csolnok
curmurring
darcys
deflection pool
digital valve
do your worst
Drehsprungstemme
fake books
finished green body
fragment grenade
funny picture
gagg
garniest
green grocer
green PC
helicobasidia
hexenoic
high-melting fibre
impastations
impulse conducting fibers
initial chamber
Investment opportunity set
irrigation scheme
lactea
languish over
law of tolerance
leisch
lovabilities
LR language
mathematical school
median voter theorem
megafans
motor group
notres
nurstle
one-wheel
onyon
paly
pentasil
plagiosaurid
plate gage
pluvioviscid
Polygonideae
protector tube
randia accumina-tissima merr.
redgate
riveting hull structure
safe custody charges
sedin
semiacephalus
sensitive species
shelled pea
Shoot-Through Current
sliding mould-type press
spelunkings
stfdoms
superstorms
synchronous communication satellite
thaumatoptyx uranicoptyx
thiometon
time-phased
to agitate for sth
too long
tool shank for endmill
transiency
transient variation
Tuxtla Gutierrez
two pipe direct return system
uncompensated requisition
varied life
vasculosus
vortex-shedding noise
wapahani
weighted-resistor digital-to-analog converter
wheelmen
Zapfendorf
zoometrical