名词
中文翻译：直部分
同义词：
['direct portion', 'straight segment']
例句：
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1.The car's engine has a straight portion that needs to be replaced.
这辆车的发动机有一个直部分需要更换。
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2.The straight portion of the road is uneven and can be dangerous.
这条路的直部分不平整，可能会很危险。
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3.The engineer measured the straight portion of the pipe to ensure it was within specifications.
工程师测量了管道的直部分，以确保它符合规格。