第一部分 翻译（出处为PetroWiki）

1) In general, the floating roof covers the entire liquid surface except for a small perimeter rim space. Under normal floating conditions, the roof floats essentially flat and is centered within the tank shell. There should be no vapor space underneath a welded-steel floating roof. Under normal conditions, the amount of product vapor that might become trapped beneath the floating roof should be insignificant. However, if large quantities of flash vapor or other noncondensable vapors become trapped, the floatation stability of the roof can be affected. These conditions should be avoided if possible.

2）Field-welded storage tanks easily meet industry needs for increased storage capacity whether at a remote production site, at the refinery, or at the marketing terminal.

翻译的专业性仍有提升空间，注意熟练运用翻译信达雅技巧。

第二部分 听力

播放mp3  3-5遍

第三部分

启动PetroWiki专题大作业（4人一组）