A boy pushed him from behind, and he would have fallen again if another had not caught him.

一个男孩从后面推了他一下，要不是另一个男孩抓住他，他还会再掉下去的。

youdao

He could react jealously when and if another child comes on the scene.

如果有别的孩子加入其中，他可能会表现得相当嫉妒。

《柯林斯英汉双解大词典》

If another option appears, getopt fails.

如果出现别的选项，则getopt将会失败。

youdao

If another photon strikes one of these high-energy electrons, the electron releases two photons that travel together at the same wavelength.

VOA: special.2010.09.01

If another receptor operating from a different ligand does the same thing, generates an enzyme which causes cyclic AMP to increase, the rate of cyclic AMP increase is going to go up faster than if only one of these was activated.

如果受另一种配体激活的受体,能够完成相同的过程,即激活一种能够促进cAMP生成的酶,cAMP的生成速率会比,只有其中之一被激活时更加快

耶鲁公开课 - 生物医学工程探索课程节选

For example, if you are out late after work and you catch your girlfriend with another boy.

例如，如果你下班后在外面待得比较晚，这时你看到你的女朋友和另一个男孩在一起。

It seems 课堂 - SpeakingMax英语口语达人

But don't be surprised if another major change in the game plan is in the works.

FORBES: Changing the Game Plan

If another driver challenges you, take a deep breath and move out of the way.

FORBES: Cities With The Most Frustrated Motorists

If another full-blown recession can be avoided, stocks should be higher in the long term.

FORBES: AAII Survey: Bullish Sentiment Stays Below Historical Average