Demonstrations, films, and videotapes are shown for your edification.采用了演示及播放电影和录像带的形式，以起到教育作用。Lectures will be interspersed with practical demonstrations.讲课中将不时插入实际示范。The scientist elucidated his theory by three simple ...
This paper introduces mechanism, research methods and main results about microbubble dray reduction.该文介绍了微气泡降阻机理 、 研究方法和重要结论.A dray is a type of horse - drawn vehicle.雪橇是一种马拉的交通工具.She stood doggedly in checkout lines; sh...