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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；

know

v. 知道，了解，认识，确信；n. 知情；

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；

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；

exothermic

adj. 发热的，放出热量的；

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；

reactions

n. 反应( reaction的名词复数 )，反动，反对，反作用力；
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