When a commercial airliner is trapped within a ring of erupting volcanoes, the passengers and crew must find a way to survive - without landing.
当一架客机困在一堆喷发的火山中时，乘客和机组人员必须设法求生——在不降落的情况下。
The relative position between powder sending landing and spot can effect the quality of ring sample, if powder locates inside of spot, the outside wall of ring sample is smooth;
送粉落点与光斑相对位置会影响环形件的内外壁品质，粉末偏向光斑内侧，环形件外壁光滑；
There was a gas ring in the fender, and a shelf where food was kept, and on the landing outside there was a brown earthenware sink, common to several rooms.
屋子里有个煤气灶，一个食物柜，外面的台阶上有个棕色的陶瓷水池，是几家合用的。
The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.
就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。
The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.
就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。
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