Question

How often 的用法和意义是什么啊？急！！！！！！

Answer 1

how often conj.1. 多长时间一次,多久一次
The spokesperson did not disclose how often such changes were made, but said they were rare.
这位发言人没有透露这样的修改发生的频率有多高,只是说很罕见。

This goes beyond the information provided in the annual report to how often companies have to make disclosures.
除了年报提供的信息以外,还包括企业披露信息的频率。

You would be surprised to hear how often I watched you, how often I was on the point of falling in with you.
听说我经常守望你们,经常差一点被你们撞见,你会感到惊奇。

How often we ignore the monthly bills, or place them in a different mental category than the initial cost.
我们经常忽略了每月支付的账单,或者是在心理上将它们归在一个与首付成本不同的类别。

As a result, most administrators did not know how often online defragmentation was completing for each database.
因此,大多数管理员不知道每个数据库完成联机碎片整理的频率。

Is the type that defines how often the agent runs when frequency_type is 4 (daily), and can be one of these values.
定义当frequency_type为4(每天)时代理运行频率的类型,可以为下列值之一

Uses exact terms and includes quantities: how often, how much, when etc.
使用精确的术语及包括数量:频度,多少及什么时间。

But no matter how often they repeated the words, with many different inflections, they were unable to wring any more meaning from them.
无论重复说多少遍,重音位置如何变化,他们都无法从字里行间挖出任何含义。

Consistency: How often parents follow through with forewarned punishment, for instance.
例如:父母执行预先警告的惩罚的频度。

We have called those numbers many times over the years and it's amazing how often the winemaker or winery owner answers the phone.
若干年来我们曾多次打过这些号码,酿酒师或酒庄老板亲自接电话的概率高得惊人。

Answer 2

how often 指每隔多久,多久一次，主要用来对频度副词或状语(如：once a week, three times a month 等)提问。如：

A：How often does he come here? 他(每隔)多久来一次?

B：Once a month. 每月一次。

A：How often do you visit your mother? 你多长时间看你妈妈一次?

B：Once a week. 一周一次。

Answer 3

how often... 问的是（某人做某事的）频率
例如：how often do you come to China? 你一般多久来一次中国？