Combustion systems can fire on natural gas or propane.

燃烧系统可使用天然气或丙烷。

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Thus, the supply of two kinds of internal combustion engine systems are very different.

因此，两种内燃机的供给系统有很大差别。

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Thus, the supply of two kinds of internal combustion engine systems are very different.

因此，两种内燃机的供给系统有很大差别。

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