That god's name was Vulcan hence the word volcano which appeared as an English word in 1613 in the travel writings of Samuel Purchas.
那位神的名字叫做Vulcan，于是就有了后来英语里的volcano。volcan o于1613年出现在萨缪尔·帕切斯(Samuel Purchas)的游记中。
Some gases stick more than others, and hence travel more slowly down the column.
一些毒气分子附着得比较厉害，以至于他们在圆柱中穿行的速度比其他分子慢得多。
Hence, it is important for travel agency to set up favorable service image.
通过对在渝旅行社的抽样调查，基本掌握了在渝旅行社服务形象现状。
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