The difference not only consist in the softness (or hardness) of the padding, but also in the size of the cabin or the number of seats in a car.
这其中的区别不仅仅在于乘坐物的软硬，还包括车厢的尺寸或者座位的数量。
2
A good procedure to follow is to heat-quench a number of small specimens of the steel at various temperatures and observe the result, either by hardness testing or by microscopic examination.
要遵循的合适步骤是将这种钢的一些小试件加热到不同的温度后淬火，再通过硬度试验或显微镜检查观测结果。
3
No discoloring, swelling, blisters or film loss; Hardness reduced by one lead number maximum.