名词
中文翻译：密封介质
同义词：
['sealed fluid', 'sealed liquid']
例句：
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1.The sealed medium is used to prevent the spread of bacteria.
这种密封介质被用来防止细菌的传播。
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2. The sealed medium was carefully sealed before being transported.
在运输前，这种密封介质被小心地密封起来。
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3.The sealed medium was tested for contamination after it arrived.
这种密封介质到达后，进行了污染测试。