As an exercise, write a function that takes a string as an argument and displays the letters backward, one per line.

下面就练习一下了，写一个函数，接收一个字符串做参数，然后倒序显示每一个字符，每行显示一个。

youdao

A standard exercise stage may consist of more than one string.

而一个标准程序射击的关卡可能由超过一个射击序列所组成。

youdao

In a highly unscientific, but hopefully revealing exercise, we asked a string of Lib Dem members to name the one coalition policy they can point to as unmistakably theirs.

BBC: Lib Dem conference: What have they done with power?