Varied Practice, also known as interleaved practice, is a learning technique that mixes different types of problems or skills to be learned within a single study session.

多样化练习，也称为交错练习，是一种将不同类型的问题或技能混合在一起的学习技巧，可以在单个学习课程中学习。

Again, they talk about this a lot in the book Make It Stick, but the idea is that basically we want to be interleaving various different things in a single study session.

同样，他们在《Make It Stick》一书中谈了很多，但基本上我们想在一个学习环节中交织各种不同的东西。

These tools would evaluate the satisfaction of a YouTube user by using things like long click through rates and also how long they spent watching in a single watch session.

这些工具将使用诸如长点击率以及他们在单个观看会话中花费的时间来评估YouTube用户的满意度。

This method works by taking advantage of the spacing effect, a psychological phenomenon where information is more easily retained when it is studied in spaced-out intervals rather than in a single, concentrated session.

这种方法利用间隔效应起作用，这是一种心理现象，当以间隔开的间隔而不是在一个单一的、集中的会话中研究信息时，信息更容易保留。