因为注水很难使轮胎十分饱满，而且也不能减轻车身重量。
Because the water is very difficult to tire full, but it does not reduce body weight.
车身重量在两轴间的得到均匀分配，从而提高了驾驶稳定性。
Driving stability is enhanced by the even distribution of weight between both axles.
不等厚板激光焊接技术在汽车制造中的应用，有效地降低了车身重量，节约了生产成本。
The application of dual beam laser welding of different thickness blanks in automobile manufacture leads to decreases vehicle weight and reduces manufacturing costs effectively.
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