1. Introducing the structure design, working principle and performance of double sealed guide valves. 介绍了双密封导轨阀的结构设计、工作原理与性能特点。
2. Refrain from drinking tap water. Buy bottled water (from sealed bottles) or boil the water before drinking it. 避免饮用自来水。购买（密封的）瓶装水，或在饮水之前将水煮沸。
3. Behind the lion towers a huge mound or pyramid and under it is found a large, oval chamber which appears to be hermetically sealed. 在狮城的后面是巨大的土堆或金字塔，在金字塔下方发现一大型、椭圆形房间，房间看起来就是密封的。
英英解释
adj.
1. established irrevocably
2. closed or secured with or as if with a seal
3. undisclosed for the time being
4. determined irrevocably
5. having been paved
6. covered with a waterproof coating
7. (of walls) covered with a coat of plaster
