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当与硫磺、磷、你从某处获得的某种热量(比如说摩擦力)混合时，它就变得很不稳定。
When mixed with sulfur, phosphorus, and the kind of heat you get from, say, friction, it's very unstable.
轮胎是由天然橡胶与合成橡胶制成的混合物，从而具有汽车制造商所要求的摩擦力和耐用性。
Tyres are made of a combination of natural and synthetic rubber to provide the grip and endurance required by carmakers.
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