19 tree species 个树种
While the least diverse mix, with only 19 species, lives aft of your ears.
皮肤上细菌种类最少的地方在你的耳朵后面，只有19种。
The feature of eggs and its hatching rate of 19 species of plank tonic copepods common in Xiamen waters were investigated.
在厦门海区，调查了19种常见的自由产卵的浮游桡足类卵型及其孵化率。
In this paper the 19 species were made into a searching list. To every species, there were their corrected synonyms, morphology descriptions, micrographs and analysis discussions.
本文对这19个种编列了检索表，对每一个种均附有同物异名的订正、形态描述、显微照片及分析讨论。
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