这两位候选人各有优缺点，一个是勇敢的老将军，但有时略显暴躁，一位是激情四射的年轻的梦想家，但有时稍显不切实际，这两者形成的鲜明对比。

Both candidates have their flaws and their admirable points; the doughty but sometimes cranky old warrior makes a fine contrast with the inspirational but sometimes vaporous young visionary.

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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 %.

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