At this height, anything can be a big problem.
在这一高度上，什么事都会称为一个大问题。
At this height, a climber can peg out from lack of oxygen.
在这样的高度，登山者会因缺氧而晕倒。
At this great height, rocks, warmed by the sun, melt small snowdrifts.
在这个异乎寻常的高度上，岩石被阳光加热，融化了小雪堆。
This was before the steam locomotive, and canal building was at its height.
这些事情都发生在蒸汽火车出现之前，而且，运河修建在那时正处于繁荣时期。
This is the first time we are cleaning at that height, in the death zone.
曾七次登上世界最高峰的纳姆格亚尔 夏尔巴说：“这是我们第一次在死亡区这么高的地带清理垃圾，难度很大，也很危险。”
This time, he performed at a height of 30 feet, almost three storeys high.
这次，他表演在30英尺的高空走钢丝，差不多有三层楼高吧。
This time, he performed at a height of 30 feet, almost three storeys high.
这次，他表演在30英尺的高空走钢丝，差不多有三层楼高吧。
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