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)...
两国之间很少有贸易往来。The two countries do little trade with one another.11月美国的贸易赤字扩大到75.9亿美元。The US trade deficit widened to $7.59 billion in November.该国的贸易顺差增加到165亿美元。The country's trade surplus widened to 16.5 billion doll...