轮胎中也含有硫，是在硫化过程中加入的，让橡胶有更好的回弹性。

Tyres also contain sulphur, which is added as part of the process of vulcanisation that makes rubber into a suitably resilient material.

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因此，一个普通车胎含有约1/5天然橡胶，而一个飞机轮胎中则超过4/5。

Around a fifth of an average car tyre is therefore made of natural rubber. In an aeroplane tyre that figure can be more than four-fifths.

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因此，一个普通车胎含有约1/5天然橡胶，而一个飞机轮胎中则超过4/5。

Around a fifth of an average car tyre is therefore made of natural rubber. In an aeroplane tyre that figure can be more than four-fifths.

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