They were given a choice between receiving a small reward, such as a cookie, immediately, or if they waited 15 minutes, they could have two.

孩子们可以选择立即得到一个小奖励，比如一块曲奇，或者如果他们等15分钟，就可以得到两块曲奇。

youdao

They are more worried about how far they will have to walk today to get clean water or if they can feed themselves and their families.

他们更担心今天要走多远才能得到干净的水，或者他们能否养活自己和家人。

youdao

If we had rock samples to study, we'd know whether these small craters were formed by impacts during the final stages of planetary formation, or if they resulted from later meteor showers.

如果我们有岩石样本用于研究，我们就能知道，这些小陨石坑是在行星形成的最后阶段被撞击形成的，还是后来的流星雨造成的。

youdao

No one knew if they could get the spacecraft back to Earth, or if they could survive long enough to return.

VOA: special.2009.07.22

Or if they hit the ball in the air and they're caught, they're out.

或者他们在空中击球，并且被抓到了，他们就出局了。

板球的规则 - SpeakingMax英语口语达人

Things can't become holy and can't come into contact with the holy or the sacred if they are not first pure.

事物不可能变得神圣或是与神圣有联系,如果它们连纯洁都算不上。

耶鲁公开课 - 旧约导论课程节选

Many countries do not pursue insider-trading convictions, or if they do, only impose financial penalties.

ECONOMIST: The fight against crooked trading gathers pace

Or if they can't explain to us the process of how they delivered results.

WSJ: What It's Like to Interview at Amazon

Children were kept away if their temperature had risen or if they were undergoing tests.

NEWYORKER: Amundsen