时间:2018-12-28 作者:英语课 分类:趣谈英语


英语课

Pre-Listening Vocabulary



caffeine: a drug found in some plants, including coffee seeds and tea leaves
pesticide 1: a substance that keeps insects or harmful materials away from a plant
alert: awake and paying attention
ward 2 off: to keep away something harmful

Caffeine Is A Natural Pesticide


 


Caffeine wakes us up and helps us stay alert. Many people rely on a caffeine kick a few times a day. In fact, coffee and tea are the most popular beverages 3 in the world, making caffeine the most popular drug. Caffeine is found in the seeds, leaves, and fruit of certain plants. Have you ever wondered why caffeine exists in coffee seeds and tea leaves? Studies have shown that caffeine is a natural pesticide. It gives off a bitter odour to ward off or kill insects that come to feed on it. While caffeine is generally safe for humans, it can be toxic 4 to pets and should be kept away from cats, dogs, and birds.



1 pesticide
n.杀虫剂,农药
  • The pesticide was spread over the vegetable plot.菜田里撒上了农药。
  • This pesticide is diluted with water and applied directly to the fields.这种杀虫剂用水稀释后直接施用在田里。
2 ward
n.守卫,监护,病房,行政区,由监护人或法院保护的人(尤指儿童);vt.守护,躲开
  • The hospital has a medical ward and a surgical ward.这家医院有内科病房和外科病房。
  • During the evening picnic,I'll carry a torch to ward off the bugs.傍晚野餐时,我要点根火把,抵挡蚊虫。
3 beverages
n.饮料( beverage的名词复数 )
  • laws governing the sale of alcoholic beverages 控制酒类销售的法规
  • regulations governing the sale of alcoholic beverages 含酒精饮料的销售管理条例
4 toxic
adj.有毒的,因中毒引起的
  • The factory had accidentally released a quantity of toxic waste into the sea.这家工厂意外泄漏大量有毒废物到海中。
  • There is a risk that toxic chemicals might be blasted into the atmosphere.爆炸后有毒化学物质可能会进入大气层。
学英语单词
Alizay
andira inermiss
antiblue
antihedonism
archabbot
archin(e)
aroun
asparty-L-histidine
assembler machine
automatic computer
bear-pit
bore diameter of roller and cage thrust assembly
bouncinesses
brown v board of education
business expenditures for new plant and equipment
cantilever for basket
capacitacin
chromosomal RNA
column fractionating
critical regionalism
cyclic fatigue
dilatory
diplophase
directed edges
engaging piece
eoples
ersbyite (meiomite)
Eunectes murinus
feebates
fixed assets cost
fly right
food sources
genitourinary fistula
geometric locus
gielgud
gift-giving ritual
herpetineuron wichurae(broth)card.
Holmes's sign
hybrid storm
Inchkeith
including overtime
indian rupee
insaturity
inter-sectoral division of labour
intercoordination
jasminum prubescens willd.
K-back
least square solution
leib
level gage
lightwave
listeria meningitis
Lomnice nad Popelkou
lose concentration
low power objective
macrotrichia
Madhya Pradesh
magmatic
magnetic fault detection
margent
marketing risks
menaced
minimal space
moderately volatile fuel
money talks, bullshit walks
mortonagrion hirosei
nonlinear taper
object relation theory
octingentenary
opern
optical enlargement
perfluoro-
polarization spectroscopy
proportional weir
prospective path
Purkinje's phenomenon
Pyrus hopeiensis
quitclaimance
reciprocable motor
Red Pt.
relationists
repumping
running time
sap vesicle
single equation regression prediction
smallpox cake
spangled coquette
splash-landed
st. vincent and the grenadiness
standard test for glass viscometer
structural platform
table calculation
touchscreen
twenty-somethings
two-years
UHF converter
Upper Cretaceous
vent-type injection moulding
warm regards
wave-modulated oscilloscope tube
Yamakoshi
zero-access instruction