名词
中文翻译：直腿
同义词：
['straight leg', 'straight shaft']
例句：
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1.The car has a straight shank that makes it easy to drive.
这辆车有一条直腿，驾驶起来很方便。
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2. The soldier had a straight shank and was able to shoot accurately.
士兵有一条直腿，能够准确射击。
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3.The tree's trunk is straight, which helps it grow taller.
这棵树的树干是直的，这有助于它长得更高。