As we travel south, the countryside begins to undulate as the rolling hills sweep down to the riverbanks.我们一路南行，乡间开始变得起伏不平，绵延的山峦一直延伸到河岸。The old lane that used to connect Elm Street to riverbanks was overgrown.从前连接榆树街和河岸的...
The diaphragm vibrates , thus setting the air around it in motion.膜片振动,这使得周围的空气也动荡起来.The diaphragm draws air into the lungs.横膈膜向下运动让空气进入肺部.A portion of the cardia is demonstrated above the diaphragm.膈上发现部分贲门....
This pneumatic tool will double the speed of assembly.这个气动工具可以把装配速度提高一倍.Light kernels may be removed by a pneumatic or air seperator.轻的籽粒可以通过空气动力,即气流分选机清理出来.We replaced hand picks with pneumatic picks and electric drills...