At the crucial moment, he showed great foresight and turned back the powers of darkness.

在关键时刻，他高瞻远瞩，力挽狂澜。

The crucial moment had arrived.

关键时刻来到了。

She broke into the conversation at a crucial moment.

她在关键时刻打断了谈话。

At the crucial moment, he insisted in the end bravely.

关键时刻，他勇于坚持到底。