Keep a tight rein to

对……严加控制、约束

Jobs kept a tight rein on the hiring process.

乔布斯对招聘流程有着严格的控制，

That is my job. So I come prepared. I hold the conversation with a tight rein, and I'm armed with knowledge of the history.

那是我自己的工作。所以我充分备课。我严格控制对话内容，我对历史如数家珍。

If anyone considers himself religious and yet does not keep a tight rein on his tongue, he deceives himself and his religion is worthless.

若有人自以为虔诚、不勒住他的舌头、欺哄自己的心、人的虔诚是虚的。

Y et one of the big questions posed by the Chinese plan is whether the authorities will really be able to keep such a tight rein on the process.

然而，中国人民币国际化计划的重大问题之一是，官方是否真能对整个进程保持如此严密的控制。