Vacillation is the cause of his failure.
优柔寡断是他失败的原因。
You are expected to answer the call with immediate actions and not with vacillation.
希望大家闻风而动，不要举棋不定。
Exclusion of air creates a vacuum in the bottle.
瓶子里的空气排除后就产生真空。
Vacuum cleaners work by suction.
真空吸尘器靠抽吸除尘。
This kind of decision cannot ever be made in a vacuum.
这种决定绝不能脱离实际。