I knew his help wouldn't be given gratis.

我知道他的帮助不会是无偿的。

《牛津词典》

I am deeply indebted to him for his help.

我对他的帮助深深感激。

《柯林斯英汉双解大词典》

His help can prove invaluable.

他的帮助是无价的。

youdao

He also offered his help in ending the revolt.

VOA: special.2010.07.15

The account of the conquest in Joshua 2 through 12, is concerned to express the basic idea that Israel's victories would not have been possible without Yahweh, without his wondrous help.

在《约书亚书》第2到12章中记叙的征服，想要表达一种基本的观点,以色列不可能获胜，如果没有耶和华，没有他神奇的帮助。

耶鲁公开课 - 旧约导论课程节选

Now in 1644 when he wrote the Areopagitica, Milton may have forgotten that Spenser's Guyon did in fact descend in to hell without the help of his teacher, the palmer.

644年他在《论出版自由》中写道，弥尔顿可能忘记斯潘塞笔下的盖恩事实上是在,没有自己的老师朝圣者的帮助下进入贪神之洞的。

耶鲁公开课 - 弥尔顿课程节选

He had Robertson taking a share in his future in exchange for his help.

BBC: How good is Button?

Part of her strategy was to let go of perfection and show appreciation for his help.

FORBES: Time

And I'm very grateful for his help, for his - making the case for me.

NPR: Despite Polls, Hillary Clinton Is Optimistic About S.C.