千钧一发时他拉住了我。
At the critical moment he pulled me back.
(lit.) a thousand pounds hangs by a thread (idiom); (fig.) (at the) critical; perilous (moment)
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千钧一发时他拉住了我。
At the critical moment he pulled me back.
千钧一发之际救下了孩子。
He saved the child at the last possible moment.