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.
燃料系还把废气通过排气管排出。
The fuel system also exhausts the effluent gas through the exhaust pipe.
减小摩托车排气污染的理想清洁燃料首选LPG。
To decrease the tail gas pollution of motorcycle, the ideal clean fuel is LPG.
是的，他们很接近排气量和燃料消耗的限制。
Yes they are close to the limit of displacement and fuel consumption.
是的，他们很接近排气量和燃料消耗的限制。
Yes they are close to the limit of displacement and fuel consumption.
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