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
amphipsocus formosanus
arcuated roof
area of specialization
argema
asaprol
barrier coupling
bevel
biostrategy
bookbanks
brachium opticum
brand share (or market share )
Bryusa, Mys
bulbar conjunctiva
caliculato-
capacitive storage welding
caso
chromazol violet
class Chytridiomycetes
closed formation
clutch release sleeve
compound drift of gravimeter
comprehensive trace
cortic-
decentralism
deviation and offset
dioctadecylamine
East Midlands
electric ceramics
electromagnetics transmitter
Endonema
esculate
Etocas(10)
euglena viridis ehrenb.
face south
fixed and group flashing
flunge
foldage
fork and spoon
freon gas
full set bills of lading
fuzzy-headed
gawkishly
giovannas
ham e-mail
heavy sell
heug
host avoidance
hydraulic gravel fill
hydroxymethyfurfural
idolist
inserted carbide
iron works
j2ee connectors architecture
lakia
land confiscation
latynn
leave it alone
length sensing device
library text
longart
mailbox name
minimal-latency coding
neutron collimator
noncommercially
ocular chalcosis
ordnance storeroom
overall network
pentaconter
peripheral nervous systems
personal control
petroleum base
phase something out
policy group
polygenies
polynomial interpolating function
posterolophids
priority interrupt I/O
rabalais
random chain
rectangular fluidized bed
recumbent fold
refractory deposition
remote measuring unit
ring fissure
routinizations
shaft of rib
si face
skip twill
slobs
snaffled
some other time
storage print program
surface-reaction control
target profit
test and plugging up circuit
the ground connection
transformer grounding switch
truncation (of a string)
typoing
ultra-high-frequency tuner
universal quantity
yieldings