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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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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During the mass concrete construction in bridge structure, the cement hydration heat is easy to cause surface cracking.

大体积混凝土在桥梁施工过程中，由于水泥水化热容易引起表面裂缝。

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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