Predicate is another common form of query expression that evaluates to either true or false.

Predicate是计算结果为true或false的常见查询表达式形式。

youdao

It is here, though, that a common question is asked: How do you write the query expression to get the correct node from an arbitrarily complex DOM?

但是，这里经常有人提问这样一个问题：如何编写查询表达式才能从任何复杂的DOM中获取正确的节点？

youdao

One such example is when the pushed down query is a common sub-expression.

一个例子就是被下推的查询是一个公共子表达式。

youdao