For example, "cracking" involves breaking larger hydrocarbons into smaller ones with either heat or catalysts.

例如，“裂解”在催化剂和加热下，将大分子的碳氢化合物破坏成小的。

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When need long time stop outdoor conditions, the vehicle should avoid direct exposure in the sun, to prevent the door seals, skylight on the edge of the deformation and cracking due to heat.

当遇到需要长时间停靠户外的情况时，车辆应尽量避免直接在阳光底下暴晒，以防止车门、天窗边上的密封圈因受热而发生变形和龟裂。

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Additionally, adjusting the air flow to achieve a reasonable coke yield also increased the heat of cracking into a region also consistent with residual operation.

另外，调节空气流量以达到一个合理的焦碳收率，还能提高裂化热到与渣油操作相符的范围。

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The extruder is designed specifically for use with MakerBot PLA, a new plastic material based on corn, that Bre Pettis claims wont expand when exposed to the heat -- which means it wont contract when it cools, leading to smoother printed objects and less cracking.

ENGADGET: MakerBot unveils Replicator 2, 2X and launches retail store, we go eyes-on