By releasing the steam, part of this energy is exploited in the engine's middle cylinder thus significantly increasing economy of such engine.

蒸汽释放，这部分能量利用了发动机的中缸，从而大大提高这种发动机的经济。

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The combustion space is in the middle of the cylinder between the pistons.

燃烧的空间位于气缸中部，在两个活塞之间。

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But the loop flow in the middle of cylinder is too weak to scavenge the exhaust gas.

而在气缸中部较弱，难以将废气彻底排出。

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