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?
Whereas the poverty rate among youngsters living with two married parents
is 7.5%, among those raised by a single mother it is 35%. 麻烦请问一下老师,这个句子中前面的among短语和后面的among短语分别作什么成分,后者为啥要提前?