无可否认，如果行动快一点，本来是救得了他们的。

There's no denying (the fact) that quicker action could have saved them.

《牛津词典》

如果行动正确，结果会自然呈现。

If you are doing the right things, results will show.

youdao

如果行动，你将开始相信，你将采取行动，你将开始改变。

If you do, you will begin to believe, you will begin to take action, you will begin to change.

youdao

if developing countries do not take some action to reduce their trajectories,

如果发展中国家不行动起来减少排放的话，

全球变暖和发达国家 - SpeakingMax英语口语达人