这些处理在提供了隔声与用于涂刷表面的同时，也密封了内部。
These processes, as well as providing acoustic isolation and a surface for finishes, also air-seal the interior.
晶体振荡器、声表器件陶瓷外壳具有全密封，强度好，外形小等特点，便于器件安装和封盖。
The ceramic shells for crystal oscillators and audiometers have characteristics of complete sealing, good strength, small volume etc. They are easy to fix and seal.
多重密封设计，防止漏声；
Multiple sealing design and prevention of sound transmission;
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