To signal an emergency, use the rule of three; 3 shouts, 3 horn blasts, or 3 whistles.
对企业的控制包括确保一切按照已采纳的计划、已下达的命令和已制定的原则进行。
如果你不能身高七尺,那就聪明七尺。
The only thing we have to fear is fear itself.