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。
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.
压实膨胀黏土水渗透系数受吸力、围压、干密度、饱和度等因素控制。
The pore water permeability coefficient of unsaturated expansive soil is controlled by suction, cell pressure, dry density and degree of saturation of soil samples.
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