但你必须要知道怎么去实现它。

But you have to know how to do it.

youdao

你必须要知道在什么时间，吃多少合适的食物。

you have to learn eating the right foods at the right time during the day in moderate amounts.

youdao

在你有目的的生活中，你必须要知道你有着怎样的价值和你所能做的事情。

You need to know for yourself just how worthy and capable you are of living your true purpose.

youdao

If the question of time is not explicitly brought up, then you should know that you have to use this formula.

如果时间的问题并没有明确提出,那你应该知道,必须要用这个式子

耶鲁公开课 - 基础物理课程节选