Who is to preside over the meeting hasn't been decided.

这个会议要谁来主持还未决定。

I will preside over the wedding ceremony of my friend.

我将会主持我朋友的婚礼。

His experience enabled him to preside over the business in an efficient way.

他的经验使他有效地管理着公司。

I was not paid to preside over the failure.

我不用对这次失败负责。