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They know nothing about exothermic chemical reactions.是什么意思？

They know nothing about exothermic chemical reactions.

他们对放热的化学反应一无所知.

相关词汇
they know nothing about exothermic chemical reactions

they

pron. 他/她/它们，人们，大家，政府，当局，她们；
例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

know

v. 知道，了解，认识，确信；n. 知情；
例句
I know you're above me socially, but I must say I find your attitude offensive...
我明白你的社会地位比我高，但我得说我觉得你的态度很粗鲁。

nothing

pron. 没有东西，没有事情，无关紧要的东西，毫无趣味的事；n. 无关紧要的人[事]，零，无；adv. 毫不，决不；
例句
I have nothing against foreigners.
我对外国人并无芥蒂。

about

prep. 关于，大约，在…周围；adv. 大约，在附近，在四周，几乎；adj. 在附近的，四处走动的，在起作用的，在流行中的；
例句
The helicopter can zip along at about 150 kilometres an hour.
该直升机能以每小时150公里左右的速度疾进。

exothermic

adj. 发热的，放出热量的；
例句
Is Hell exothermic ( gives off heat ) or endothermic ( absorbs heat )?
地狱是散 发热量 还是吸收热量?

chemical

adj. 化学的，用化学方法制造的，化学作用的；n. 化学药品，化学制品；
例句
The chemical companies had amalgamated into a vast conglomerate...
那些化学品公司已经合并成一个庞大的企业集团。

reactions

n. 反应( reaction的名词复数 )，反动，反对，反作用力；
例句
Soya milk can cause allergic reactions in some children.
有些孩子会对豆浆过敏。
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
Introverted Borzois, and Borzois who love everyone.
内向的猎狼, 它可以与任何人和睦相处.
'The matter is closed,' was the curt reply.
得到的答复简短而无礼：“事情已经结束了。”
She will present the trophies to the award winners...
她将给获奖者颁奖。
Some acupuncturists still use gold and silver needles but the majority only use stainless steel ones.
一些针灸师仍然使用金针或银针,但大部分医师使用不锈钢制成的针.
I was an unwilling witness of their quarrel.
我不愿做他们吵架的见证人。
The boss never cared whether a worker should live or die.
老板从来不顾工人死活。
The chieftain of that country is disguised as a benefactor this time.
那个国家的首领这一次伪装出一副施恩者的姿态。
A bold attempt is half success.
勇敢的尝试是成功的一半。
I suppose some people create an idea of who they want to be, and then they live it out.
我想有些人会先设定好自己要成为什么样的人，然后身体力行。
Please pack the food for me.
请为我把这些食品打包。