Vacillation is the cause of his failure.

　　優柔寡斷是他失敗的原因。

　　You are expected to answer the call with immediate actions and not with vacillation.

　　希望大家聞風而動，不要舉棋不定。

　　Exclusion of air creates a vacuum in the bottle.

　　瓶子里的空氣排除后就產生真空。

　　Vacuum cleaners work by suction.

　　真空吸塵器靠抽吸除塵。

　　This kind of decision cannot ever be made in a vacuum.

　　這種決定絕不能脫離實際。