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....
There's been a lot in the papers about the problems facing stepchildren.报纸上有很多关于继子女所面临的问题的报道。His commitments to the stepchildren will not reduce his obligation to his natural children.他对继子女的关爱和投入不会减少他对亲生孩子的责任。Do ste...