bottom dead center

常见例句

The stroke is the distance the piston travels from BDC (Bottom dead center) to TDC(top dead center).
行程是活塞从下止点运行到上止点的距离。
BDC (bottom dead center) ― the position of the crank and piston when the piston is nearest to the crankshaft.
（下止点） - 当活塞离曲轴最近时，曲柄和活塞的位置。
The Bore is the diameter of the cylinder. The stroke is the distance the piston travels from BDC (Bottom dead center ) to TDC(top dead center). The Bore is always mentioned first.
内径指的是气缸的直径；行程是活塞从下止点运行到上止点的距离。表述时，内径总是写在前面。