🗣️ 情景例句
Where was that?
在什么地方？
Of nothing comes nothing.
无中不能生有。
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.
某些大公司进行的研究属于一般和基础性的研究。因此不保密对他们才有利。