名词短语
中文翻译：向前和向后的引擎
同义词：
['front and rear engines', 'front and back engines']
例句：
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1. The car's turning short round by the front and astern engine.
这辆车在前进和后退引擎处转弯。
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2. The engineers were busy inspecting the front and astern engine.
工程师们忙于检查前进和后退引擎。
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3.The race car was turning short round by the front and astern engine.
赛车在前进和后退引擎处转弯。