这可能部分源于分离寡聚物成本高耗时长——从数百公斤干燥的植物样本中可能只能分离得到数毫克的纯品。
This is partly because isolating the oligomers is both costly and time-consuming - processing hundreds of kilograms of dried plant material often yields only a few milligrams of a single product.
最后是那些为数甚多、通常低于海平面的火山，它们在板块分离、新壳产生的延展脊状突起上形成。
Finally there are those-a great many, but normally deep under the ocean-formed at the spreading ridges where tectonic plates pull away from each other and new crust is formed.
忆归期，数归期，梦见虽多相遇稀，何日重逢，不再分离？坛。
Thee number of return, return, although the dream encounter thin, when again, no longer separated?
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