I will explain to them that I can't pay them.

我会向他们解释说我无法付钱给他们。

《柯林斯英汉双解大词典》

From childhood, parents should give pocket money to their children and explain to them how to use money in a correct way and also tell them to save the money.

从童年起，父母就应该给他们的孩子零花钱，告诉他们如何正确使用钱，并告诉他们要存钱。

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Did you explain to them?

你向他们解释了吗？

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Then he called his men around him to explain to them his battle plan.

VOA: special.2009.06.18

And try and explain to them why you think your program is doing what it's doing.

向别人解释你认为的程序作用,会给你带来很大帮助。

麻省理工公开课 - 计算机科学及编程导论课程节选

Just the look in people's eyes when you can explain something to them

就看着你给他们讲解东西时候他们的眼神

重新开始学业 - SpeakingMax英语口语达人

Explain to them that everything will work out in the end and they'll probably love it.

CNN: Review: 'Babe: Pig in the City' as tasty as the first

And the women are unable to explain to them that they are children born from rape.

BBC: Kenya election: rape victim fears repeat of 2007 ordeal

We couldn't explain to them that their good life today isn't a given.

ECONOMIST: The Russian elections