在泥盆纪末期，30％的动物物种都灭绝了。Near the end of Devonian times, thirty percent of all animal life vanished.收藏矿物 、 古生物学 、 中泥盆纪 、 二叠纪到早期的侏罗纪和白恶纪.Mineral, palaeontology, middle devonian, permian to early jurassic, and cretaceous.泥盆纪(系)...
Perhaps you might chance upon the dictionary at some old bookstall.或许你会在旧书摊上偶然发现这本字典.She will never come into the bookstall again.她不会再来这个报摊了.As I was looking through some books on a secondhand bookstall , I dropped on ju...
某种有机的润湿剂或消泡剂十分有助于形成可过滤的半水物.An organic wetting agent or foam suppressant is quite helpful in the formation of filterable hemihydrate.有机化合物的含量高常常促使生成泡沫, 导致消泡剂的耗量增多.High levels of organic compounds will frequently promote f...