如有需要可选修额外的课程。Additional courses may be taken if desired.这门课程包括十个必修单元和五个选修单元。The course consists of ten core modules and five optional modules.某些课程是必修的，其他是选修的。Certain courses are compulsory, others are optional....
27 million working days are lost each year due to work accidents and sickness...每年有 2,700 万个工作日因为工作事故和病假而损失掉了。Sickness often results from eating too much.呕吐常因饮食过量所致。...boyhood memories of sickness and fear of the dark......
He carved the joint of beef.他切开了那一大块烤牛肉。They used to buy ten kilos of beef in one lump.他们过去常买10公斤重的整块牛肉。Tapeworms: Taenias - fish tapeworm, beef tapeworm, and pork tapeworm.绦虫: 软体 - 鱼绦虫, 牛绦虫及猪绦虫.roast beef and horseradis...