你必须知道参与者的名字，他们的脚的大小和大概身高。

You have to know the names of participants and their feet size and approximate height.

youdao

这一原则自有其复杂微妙之处，但是首先，就像诗人说的那样，“这就是所有你知道的，以及你必须知道的”。

Subtleties and complications surround this principle but, for starters, "That is all you know, and all ye need to know," said the poet.

youdao

可是，你必须知道的是，可能普通用户通过简单的工具就可以访问到敏感信息。

However, you need to know that there might be sensitive information which ordinary users can actually access with the use of simple tools.

youdao

but definitely have your goals, you know, lined up, and, and you will be okay.

但是必须有自己的目标，你知道，列出来，然后你就一切都好了。

为我的生活 - SpeakingMax英语口语达人