Are you flying in an aisle seat in a Dreamliner or in the middle seat in a MD-80?
是梦幻客机上一个靠近过道的座位，还是MD - 80上的一个中间座位？
The McDonnell Douglas MD-80, still widely in use, has a fatal accident rate of 0.31 per million departures.
仍在广泛使用的麦道公司(McDonnell Douglas)的MD - 80型飞机，每百万次飞行发生的致命事故数是0.31。
The feather marrow from chickens with infectious Marek' s disease (MD) was used for the detection of MDV by AGP, the potive tales were 80%.
拔取病鸡含羽髓的羽毛，用免疫琼扩试验检测，检出率为80％；
The feather marrow from chickens with infectious Marek' s disease (MD) was used for the detection of MDV by AGP, the potive tales were 80%.
拔取病鸡含羽髓的羽毛，用免疫琼扩试验检测，检出率为80％；
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