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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Agamofilaria streptocerca
any which way
arsenic(iii) oxide
arsy-varsy, arsy-versy
boiler combustion
broach-support
bromoalkynes
Campo de San Pedro
checklists of auditing procedures
circumfixes
CPC Communist Party of China
data independency
Deele R.
delivery-receiving acceptance
doped region
double-amputee
duodecim-
earnings before interest, taxes, depreciation, and amortization
Elche
emulsifiable paint
exchange control territory
exploration expenditure
fibromyomas
gasp one's life out
gastro-adenitis
general-service
graaff reinet
grain boundary sliding
group home
gupse
half-desmosome
harmonic coefficient
Herjaadalen
homogeneous bands
hyperestrinemia
illuminating mouth mirror
incitant
incurred cost
insertron
Lebowakgomo
limiting probability
link relative
Lissac-et-Mouret
lithium laurate
magoos
matookes
merit-rating plan
missile environment
Neef's hammer
nodular ore
non-circular gear
Oatax
Open Systems computing
overload quantity
oxymesterone
pack alarm
parcel rack
Perseus-Pisces supercluster
Peschici
PLATYDACTYLA
pleopoda
polyversities
Primero de Mayo Bay
proofstaff
pseudo-dipole
push-down
quadripara
re-passed
reference box
relay group
reversible fabric
run-and-gun
rushers
Rφsnæs
sandwich-like structure
screen overlay
screened area
selective filter
self-discharging purifier
semi-simple linear transformation
Sepoti, R.
Seven Years War
sforzesco
shallow open-cut surface mining
sheathed ship
significanc level
soldierless
speed time curve
stretchable film
sum digit
swipe me
tabarded
tetragonal hybrid
tie sth up
torsional braid analysis
triple bluff
use right of waters for aquaculture
veranos
verdine
villagers committee
wall-hanging
zippy