我每四周(每隔三周)回家一次。
我每隔三周去图书馆一次。
例如,如果每个软件更新要花费客户数周的工作,并需要若干人员的参与,则每隔三周发布一个新版本是不合适的。
For example, if each software update causes weeks of work for the customer and requires the work of several people, it isn't good to release a new version every three weeks.
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