以全面采样取代了几处小面积的对照取样：压实采样精确度可达100%。
Comprehensive sampling instead of several small control samples: 100% of the specimen compacted.
方法摘芽后定期进行随机取样，并与对照组进行观察测量比较，追踪牛膝根外部形态的变化。
Methods Observing and comparing the morphological change of Radix Achyranthis Bidentatae between bud picked groups and control groups in a random and at regular intervals time test.
我们收录了以随机个体或丛集取样的随机对照试验。
We included randomised controlled trials, randomised either at the level of the individual or cluster.
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