hang by a thread;hang by a hair;by the skin of one's teeth;close call;at a crucial moment;

In that second of time, at this moment of crisis, the wonderful thing occurred.
就在这一秒钟里, 在这千钧一发的关头, 一椿奇迹发生了.
来源:词典精选例句They applied all their force to the line simultaneously , and at a most critical moment.
他们在这千钧一发之际, 双双同心协力,使出浑身的劲对付着绳索.
来源:词典精选例句
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