The query expression is a building block that can be assembled to define the final selection predicate for the query.

该查询表达式是一个构建块，可以通过组装它为查询定义最后的选择谓词。

youdao

That's the "TMC 2" in the regular expression toward the top of the block.

那是接近代码块顶部的正则表达式中的 “TMC 2”。

youdao

The while loop, as was the case with the if statement, supports an optional else clause containing a block of program statements executed when the expression is False.

while循环与if语句一样，支持一个可选的else子句，其中包含一个当表达式计算为False时执行的程序语句块。

youdao