你必须保持清醒和控制力。

You have to be lucid and in control.

youdao

要对你自己和你的主题有信心。如果你要做一个更好的公众演讲者你必须保持清醒的头脑。

Faith in yourself, your topic, and your general sanity is a must if you are to be a better public speaker.

youdao

然而，因为模式使得许多实现富于变化，所以你必须保持大脑清醒。

However, since patterns enable many implementation variations you still have to keep the brain turned on.

youdao