If possible keep a spare pair of glasses accessible in case your main pair is broken or lost.

如有可能留一副备用眼镜以防你常用的那副打碎或丢失。

《柯林斯英汉双解大词典》

If possible, choose from three items or three estimates.

如果可能，从三个项目或三种估算中选择。

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"And I long for the day when that modifier can be a moot point, but I'm ever grateful if I can inspire some young intrepid tenacious male or female filmmaker, and have them feel that the impossible is possible.

VOA: standard.2010.03.08

9 or . 8 7 are possible, they actually aren't possible because even if we saw a total shielding, 1 the minimum z effective we would see is 1.

。39和0。87是可能的，实际上它们是不可能的因为即使,我们看到了一个完全的屏蔽，最小的有效电荷是。

麻省理工公开课 - 化学原理课程节选

If it's possible, use animals that don't feel pain, or use lower forms of life.

如果可以的话，请使用那些感觉不到疼痛的动物，或者用低级生物。

需要动物实验吗？ - SpeakingMax英语口语达人

To be sure, they do not want American power squandered, inappropriately exercised or, if possible, utilized without the support and help of our allies.

CENTERFORSECURITYPOLICY: Center For Security Policy

For now, Howlett said shipping operators and recreational boaters needed to take caution through the area -- or avoid it if possible.

CNN: How to solve the pirate problem

If you are travelling to the airport, take rail options instead of a taxi or the Tube, if possible.

BBC: Navigating the London 2012 exodus