The results showed that the permeability of modified inner-liner to air increased somewhat, but still could meet the requirement of inner-liner in tube-tire;

结果表明，改进后的气密层胶透气系数有所增大，但能够满足有内胎轮胎气密层的要求；

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No giant sucking sound, just the gentle hissing of an inner tube losing air, threatening a flat tire that could send the American dream machine off the road.

即便听不到较大的泄气声，只是嘶嘶地缓慢漏气，也会使名为“美国梦”的这台汽车的轮胎瘪掉，而偏离了正确的道路。

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Have a spare tube and tools, and know how to change a tire.

携带备用车胎和工具，并知道如何换胎。

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