黑烟说明有燃料在排气管中燃烧。
Black smoke is caused by raw fuel being burnt in the exhaust.
在具有低质量流量的过程中，排气管内部可能会发生局部回流。
During the process of low mass flow, local refluence may occur in the exhaust manifold.
在具有低质量流量的过程中，排气管内部可能会发生局部回流。
During the process of low mass flow, local refluence may occur in the exhaust manifold.
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