题目

英语翻译
one additional part is required to the complete a basic engine.Because it is necessary to push the piston down th cylinder more than once,in between down strokes it must be returned to the top of the cylinder.To do this,a heavy flywheel is mounted to the end of the crankshaft .When the piston is forced downed,the crankshaft turns,and the flywheel turns with it.Because the
flywheel is heavy ,it does not slow down easily.Its momentum keeps the crankshaft turning .The rotation of the crankshaft then pushes the piston back up to the tpo of the cylinder.

提问时间：2020-08-07

答案

完成一个基本发动机还需要一个部件.因为必须不止一次地将活塞推到气缸下,在下冲程时,又必须回到汽缸顶部.为此,要在机轴末端安装一个笨重的调速轮.当活塞强制向下时,机轴转动,调速轮也随之转起来.因为调速轮很重,不会轻易减速.其冲力使机轴保持转动.然后机轴的旋转推动活塞回到汽缸顶.