钢瓶是中空的管道,封闭的底部是凹入的,这样可以直立起来.A cylinder a hollow tube a closed concave base that permits the cylinder to stand upright.水平过渡交叉挡板应扣住, 凹入并隐藏.Horizontal intermediate cross rails, which are required for locks, will be recessed...
Merchant ships salute each other by dipping the flag.商船互相点旗致敬.The Queen's birthday was honoured by a 21-gun salute.鸣二十一响礼炮庆祝女王的生日。As a second lieutenant, he had to salute damned near everybody.身为少尉，他几乎是逢人便得敬礼。I salu...