The engine was very smooth in operation but had one very marked disadvantage-thermal efficiency was only about 4 %.
该机在运转方面是很平稳的，但有一个明显的缺点，热效率仅为4 ％左右。
The engine was very smooth in operation but had one very marked disadvantage-thermal efficiency was only about 4 %.
该机在运转方面是很平稳的，但有一个明显的缺点，热效率仅为4 ％左右。
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