气缸中的蒸汽膨胀并推动活塞向外运动.Steam in a cylinder expands to push a piston outward.当排气冲程开始时, 气缸被向上运动着的活塞刮掠.When the exhaust stroke starts, the cylinder is swept out by the upmoving piston.在发动机气缸里发生的动作,可以分为四个过程或冲程.The actions taking ...
Don't you think picnics are fine fun, Doctor Mcteague?你看野餐是不是有趣的娱乐, 麦克梯格医生?I have superintended cooking picnics.我曾经多次主持过这种生火的野餐.Do you go on picnics?你常去郊游 吗 ?...