节骨眼

nǐ lái dé zhèng shì jiē gu yǎn shàng

你来得正是节骨眼上！

You've come in the nick of time!

zuò gōng zuò yào zhuā zhù jiē gu yǎn

做工作要抓住节骨眼。

Special attention should be paid to the key link in one's work.

jiù zài zhè ge jiē gu yǎn shang yuán jūn gǎn dào le

就在这个节骨眼上，援军赶到了。

At this critical moment reinforcements rushed up.

jiē gu yǎn shang jué bù néng sōng qì

节骨眼上决不能松气。

At this critical juncture we must not relax our efforts.