但其排气速度却异常惊人，大约为化学燃料火箭的十倍—这使得离子推进器的效率非常高。
The exhaust velocity, though, is enormous—more than ten times that of a chemical rocket—and this makes ion propulsion extremely efficient.
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.
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