Asking for permission is a great time to set expectations, ensuring your customers know how often, and under what conditions, they will receive email communications from you.

获得应允是设定预期的好时机，可以保证你的用户知道他们收到你的电子邮件的频率以及条件。

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Even under drought conditions, trees can often provide food and a way to earn money until the next growing season.

VOA: special.2009.09.01

Fungi which don't often cause infections in people with healthy immune systems but can under some circumstances, and can be tremendous problems in patients that have weakened immune systems.

真菌在免疫系统健康的情况下通常,不引起感染,但在某些情况下也会感染,那就成了极大的问题,在免疫系统脆弱的病人体内

耶鲁公开课 - 生物医学工程探索课程节选

Very often, overpromising and under-delivering.

通常都言过其实，无法兑现。

哈佛公开课 - 幸福课课程节选

As a result, women-led companies are often overlooked and under-funded.

FORBES: Overcoming Bias: Simple Advice for Women Raising Money

It unnerves people, and as a result, they often under communicate and send inconsistent messages about the change, both of which lead directly to stalled transformation efforts.

FORBES: Think You're Communicating Enough? Think Again

In business, we often say it takes all kinds and I often watch how employees and colleagues react under adversity because it provides powerful clues to how they are wired to manage stressful situations, rejection and adversity.

FORBES: Change Your Thinking, Lower Your Stress