名词
中文翻译：顶部密封
同义词：
['top cap', 'top closure']
例句：
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1. Thetop seal on the lid is broken,so it's not secure anymore.
盖子上的顶部密封损坏了，所以现在不安全了。
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2. The topseal of the package wasdamaged during shipping.
包装的顶部密封在运输过程中受损了。
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3. The topseal on the jar is a tight fit, ensuring that the contents are protected.
这个罐子的顶部密封紧密，确保内容物得到保护。