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.

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。

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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.

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。

youdao

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.

一旦到了那儿，他们就用卷尺，测径规和一种手持式激光器来测量一片500平方米地块内的所有树木的高度和干围。

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