如果在某一次取样中，所有的锆石里都不含这种矿物，那就是在提示包体的化学成分可能已经发生了改变。
If that type of mineral is missing from all of the zircons in a particular sample, he notes, that's a clue that the inclusions may have been chemically altered.
使用根据此设置生成的真实数据，每隔五分钟进行一次取样，此图表脚本生成了如 图 4 所示的未平滑化的输出。
Using real data generated from this setup sampled every five minutes, the charting script produces the output shown in Figure 4 with no smoothing.
矿井内的气体状况每半小时就取样一次，救援人员说，他们需要一个持续下降的趋势，专业救援小组才能进入矿井。
Samples of gas conditions in the mine are being taken every half hour and rescuers say they need a sustained downward trend before specialist rescue teams could enter.
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