此函式在清除某个指定变数的变数值，变数值可以是单一值，或是阵列值。

This clears the value of an assigned variable. This can be a single value, or an array of values.

youdao

这是因为专家知道模型中的哪些变数比较重要，于是过于频繁地对各种变数做出主观调整。

That is because experts know what is important, but too often make subjective changes to the emphasis they place on various factors.

youdao

不可变数据是不能更改的，因此读取不可变数据无需用到锁，即使有多个线程读取时也是如此。

Immutable data cannot be changed and thus reading immutable data does not require locks, even when multiple threads are reading.

youdao

For the simple reason that the number of possible chess games is so huge, that computers can't calculate it.

原因很简单,棋局的潜在变数相当之大,以至于计算机根本无法将其完全计算出来

耶鲁公开课 - 死亡课程节选

However, there's one other variable that you want to be aware of and that is, he knows he ought to be going straight ahead like that, but he also knows that his right flank is open.

然而,还有其他变数是必须考虑到的,那就是,士兵知道他是向前直行的,但是,他同样知道他的右路是洞开的

耶鲁公开课 - 古希腊历史简介课程节选