backn.后面；背脊；靠背；后背；后卫vt.支持；后退adv.向后地adj.向后的；后面的；偏远的；过时的；积欠的backstayn.（帆船的）后支索；后部撑物

1. The lung function damage is limitation ventilation dysfunction and diffusion dysfunction.
   肺功能损害表现为限制性通气功能障碍及弥散功能障碍。
2. This phenomenon, peculiar to the two-dimensional wave motion, is sometimes called diffusion.
   二维波所特有的这种现象，有时叫做弥散现象。