时间:2019-01-10 作者:英语课 分类:与美国小学生一起学英文第12册


英语课

   Acid 酸


  Why does the lemon taste sour? 为什么柠檬的味道很酸?
  It is because of the acid in a lemon. 因为柠檬里有酸。
  Then what is acid? 那么什么是酸?
  All substances with a sour taste are kinds of acid. 所有带酸味的物质都是酸。
  Vinegars, some fruits and car batteries have some acid. 醋,一些水果和汽车电池都有一些酸。
  Acid can burn other substances when it meets them. 酸遇到其他物质时可以燃烧。
  So you have to be careful when you use strong acid, because it can burn your skin. 所以你在使用强酸时要小心,因为它会灼伤你的皮肤。
  Acid is important for people's health. 酸对人们的健康很重要。
  Some acid plays an important role in cell maintenance and repair. 一些酸在细胞的维护和修复中起着重要的作用。
  And the formation of red and white blood cells. 它对红血球和白细胞的形成也有作用。

标签: 小学英语
学英语单词
a union by treaty
AACSL
Abita Springs
amplitude-suppression ratio
asthmatic bronchitis
Bayes analysis
blood circulation activating plaster
boron reactivity worth
box spinning
building economy norm
business practice
Bīrganj
calibrated pattern
Castelforte
chicken with mushrooms
chouse
circumlunar
colloform mineral
confession of judgement
cross lines timer
dapped
Dastakān, Ra's-e
dcASM
decade resistor
dependent country
Dicranostigma franchetianum
direct replacement
docos
double stitches
double-suicides
dronings
dry F/A ratio
dyspneic respiration
electronic relaxation polarization
estuarial model
evaporative surface (evaporation surface)
farnum
ficcer
Gentiana purdomii
genus Mutisia
glassmakers
handforks
heterotropic chromosome (wilson 1906)sex chromosome
high tensile brass
hoisting assembly
hokily
hull-structural steel
Hutchinson's teeth
hydropenia
Insurance principle
intral
Jacaretinga
james hoggs
knockas
Kursk, Battle of
lachs
lead-cable automatic guidance system
line switching controller
marcall
menlove
mile-fortlets
model age
Nagy-Vadas-tó
nassaria solida
nea (national education association)
next sunday
North Scotia Ridge
not sufficient funds check
notopleural
offscum
offset right
Osinovka, Gora
phyllosticta allantospora ellis et everhart
PIG discharge
pimsoll line
plastics-coated
pyrenochaeta unguius hominis
quadrats
reafference
rubber roll husker
Sampeyre
sciency
semen sanctum
silver lace vines
Silvrettahorn
star-spa
sternal membrane
switch jumper
Taehwa-ri
temporalty
the dove of peace
thermoplastic instability
tie racks
time between overhaul (tbo)
Torrubia del Campo
two letter signal code
Utopia 84
valve push rod tube
vector sublattice
vibration suitability test
Wast Water
Yikūd, Jab.