若有大楼管理员请先知会一声，以利搬运进行。
If you have please prophet is building manager, and handling.
(这听起来有点像跑马场让个赌徒选赛马和骑手，压根没向赌马的人知会一声)。
This sounds a little like a racetrack allowing a gambler to select horses and jockeys to run in a race, without informing the other bettors.
在演讲开始，你就可以跟听众知会一声，在演讲结束之后他们将有机会提问题；
Tell your audience at the start that they will have a chance to ask questions at the end of your presentation;
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