sample area的用法和样例：
例句
- At the level of species categories, the means mercury contents of macrobenthos at each sample point were higher in the creek than that under forest.
在动物类别水平上，各滩的潮沟样地动物中的汞含量均值均大于相应林内样地动物。 - The density and quantity of Collembola keeps high levels in infested area and even sometimes higher than non-infested area, especially in broad-leaved forest.
弹尾目在试验样地的密度和数量均保持较高水平，有时甚至高于对照，这在阔叶林表现尤为突出。
