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。
The top dead center (TDC) phase has a great effect on the result in the combustion analysis of internal combustion engines, so it is very important to obtain the dynamic TDC phase correctly.
在进行内燃机燃烧分析时，上止点相位对分析结果影响很大，正确确定内燃机动态上止点相位显得非常重要。
TDC (top dead center) - the position of the crank and piston when the piston is farther away from the crankshaft.
(上止点)-当活塞离曲轴最远时，曲柄和活塞的位置。
TDC (top dead center) - the position of the crank and piston when the piston is farther away from the crankshaft.
(上止点)-当活塞离曲轴最远时，曲柄和活塞的位置。
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