critical height

例句：

1. 1. The engineer calculated the critical height of the structure to ensure its stability.
   工程师计算了结构的关键高度，以确保其稳定性。
2. 2.The scientists determined the critical height at which the substance would begin to evaporate.
   科学家们确定了物质开始蒸发的关键高度。
3. 3.The climber reached the critical height and started descending.
   攀岩者达到了关键高度并开始下降。