光波，无论是以太波还是其他波，在所有情况下都是时间上的周期性过程。
The best safety protocol is a culture where every worker looks out for each other.
"Writing is the art of making silence speak."
解释：君主对发生在堂上、堂下、门廷之内的事都不知道，则虽是近处，却比百里、千里、万里之外更远。
工作是世界的法则。
It is best to act with confidence, no matter how little right you have to it.