到达目标后，在圈定好的500米区域内，他们用卷尺，测径规和手持激光设备对所有树木的高度和树围进行测量。

Once there, they use tape measures, callipers and a hand-held laser to measure the heights and girths of all the trees within a 500-square-metre plot.

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但后来我们开始在环太平洋沿岸设立海平面水准仪(现在几乎所有的码头和海港都设有一到两台这样的设备)，它们通常被绑在桥墩上，可以测量海面的高度。

But then later on we started installing sea level gauges all around the Pacific Ocean. Pretty much every port and harbor in the world has one or two of these.

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到达目标后，在圈定好的500平方米区域内，他们用卷尺，测径规和手持激光设备对所有树木的高度和树围进行测量。

Once there, they use tape measures, callipers and a hand-held laser to measure the heights and girths of all the trees within a 500-square-metre plot.

youdao