He has found that smoke and toxic gases can be transported swiftly up through the atrium.他发现烟和毒害性气体可通过中庭迅速向上传播.From the left atrium the blood passes through the bicuspid valve into the right ventricle.来自左心房的血液通过二尖瓣进入右心室....
Thirteen per cent of Christie's coin and banknote auction went unsold.佳士得13%的硬币和纸币拍卖流拍。I put the coin in the machine and pulled the lever.我把硬币投入机器，拉动控制杆。The golden rule is never to clean a valuable coin.重要的原则是决不清除贵重...
So stiff is commercial competition that tunnel - diggers complain that their work is no longer profitable.业务上的竞争过于激烈,隧道挖掘工们抱怨他们的工作已不再有利可图.There were discussions about hiving off profitable BOAC routes to a private airlin...