名词
中文翻译：门框
同义词：
['door sill', 'doorframe', 'doorpost']
例句：
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1. The gate sill is thefirst thing you see when you enter thehouse.
门框是您进入房子时首先看到的东西。
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2. The old gate sill wasworn down by years of use.
旧的门框因年久失修而磨损严重。
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3.The new gate sill has been installedto improve the security of the entrance.
新安装的门框是为了提高入口的安全性。