It is noticed that oleanane triterpenoidal saponins are characteristic constituents of this family and have taxonomic significance.
结果表明齐墩果萜皂甙作为木通科的特征化学成分在该科的
统分类中具有一定的意义。
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The taxonomist sometimes overlooks whole species in favour of those groups currently under study, while the ecologist often cotlects only a limited number of specimens of each species, thus reducing their value for taxonomic investigations.
分类学家们有时会忽略整个种而选择当时正
研究的那些
种群,而
态学家常常只收集每个
种有限的几个样本,因此就降低了分类研究的价值。
One theory holds that, if Rhyniognatha was a flying insect, that would mean that the pterygotes -- the taxonomic group that includes flying insects -- first came about in the early Devonian, say, more than 400 million years ago.
一种理论认为, 如果鼻颚龙是一种飞行昆虫,那就意味着翼龙——包飞行昆虫
内的分类群——首先出现于泥盆纪早期,比方说,4 亿多年前。