Using them well (or knowing when not to use them) is a skill.

使用好模式（或知道什么时候不 使用模式）是一项技能。

youdao

Practical examples of when not to use DigestSearch include.

何时不使用DigestSearch的实际示例包括。

youdao

The guide provides information on when to use, and also when not to use, specific medicines.

指南说明了何时使用以及何时不该使用专用药品。

youdao

She and her best friend still use it, especially when they do not want their children to know what they are talking about.

VOA: special.2009.12.04

When to use "the" in a sentence, when not to use "the", when to use "an" instead of "a" or "a" instead of "the".

在一个句子中，什么时候用“the”，什么时候不用“the”，什么时候用“an”代替“a”，什么时候用“a”代替“the”。

经常犯的失误 - SpeakingMax英语口语达人

They like to--when they're computing the investment yield, they want to be completely honest and not use any rules of thumb.

当他们计算投资收益率的时候,他们需要完全精确,而非用经验公式

耶鲁公开课 - 金融市场课程节选

But it is about presidential power, how to use it, but also when not to use it.

NPR: With White House Bogged Down By Scandal, GOP Looks For Boost

By keeping in mind that study-drugs will undermine creativity, confidence, and the capacity for strategic renewal people can make more informed choices as to when to use them and when not to use them.

FORBES: When 'Study Drugs' Kill (Part 2): Reducing The Risks From Brain-Doping

Brokers will have the best knowledge of what happened to an order and can advise their buy-side clients on the most effective approach, such as when to use limits and when not to in order to avoid implementation shortfall.

FORBES: When Total Cost Analysis (TCA) Breaks Down