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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
This action makes a mockery of the Government's continuing protestations of concern...
这一行动是对一再声明表示关注的政府的嘲弄。
The semi-final finished goalless after extra time.
加时赛结束后，这场半决赛的比分还是零比零。
We'll keep you up to date with any news.
一有新消息我们就会告诉你。
Denmark recognised the potential of wind energy early.
丹麦早就认识到了风能的潜力。
Symphony No.6 in B minor , Op . 74 , Pathetique : Allegro molto vivace.
小调第六“悲怆”交响曲, 作品74——极活泼的快板.
These two questions should not be lumped together.
这是两个问题,不能往一块儿扯.
He went on to crown a distinguished career in radio and television with his book 'The Price of Victory'.
凭借《胜利的代价》一书，在广播和电视事业上成就杰出的他再创辉煌。
His eleven-year-old daughter was unharmed in the attack...
他11岁的女儿在袭击中毫发未损。
From my place of ambush, I could hear him pant aloud as he struck the blows.
我从藏身的地方可以听到他捅刀子时的喘息声.
Even if her interpretation has not yet gelled into a satisfying whole, she displays real musicianship...
虽然她的演绎在整体上还不太令人满意，但她表现出了真正的音乐才华。