of how引导什么从句

　　Keep a tally of how much you spend while you're away.

　　在外出期间，把你的花费都记录下来。

　　This dictionary has many examples of how words are used.

　　这部词典有许多关于词语用法的示例。

　　That is a measure of how bad things have become at the bank.

　　那就是银行的`局面已经糟糕到何种程度的衡量标准。