The Brief History of Time ___ by Steven Hawking. It is a great book about science.A is written B was written 难道该句子只能用被动态的过去时?有无可能用一般现在时来被动表示“客观的常识,还有常态化的含义?
For example, one explanation for why a cell may deliberately destroy itself is if its sacrifice lowers the viral load on closely related cells nearby. 经济学人最新一期的一句话,这个句子是由if引导的表语从句吗?
Sentence 1:We came out without making any noise.Sentence 2:I finished the task without make any mistakes.在sentence1中,noise是指“声响”(而非“噪音”),故可数,有复数形式noises,那么为什么sentence1中却没有加s,而sentence2中却加了s(mistakes)?谢...
UV-H2O2
photo-oxidation technology was only available for the advanced treatment of
low-turbidity water with a critical limitation of 6 NTU turbidity. H2O2光氧化技术适用于低浊度水的深度处理,降解效果以浊度6 NTU为分界点。请问老师这里的critical怎么理解?