SD of all groups was not obvious different in L4-S1 segments, TD of every groups above 15 years old was larger than that of two groups below(P<0.05);

各年龄组椎管矢径无明显差异； L4-S1节段15岁以上各组椎管横径大于以下两组（P<0.05）；

youdao

Unless otherwise specified, in this yearbook, economically active population, employment population and unemployment population are all above 15 years old.

除非特别注明，本书中的经济活动人口、就业人口和失业人口均为15岁及以上人口。

youdao

The Boeing 737-300 in question was only 15 years old when its skin peeled open along a riveted lap-joint while flying above 34, 000 feet (just over 10, 000 metres) with 118 passengers on board.

正在讨论的波音737 - 300型飞机只用了15年。当其外壳沿敲平的上端搭接接头剥落开来时，飞机上的118位乘客正飞行在34000英尺(刚刚超过10,000米)的上空。

youdao

The Boeing 737-300 in question was only 15 years old when its skin peeled open along a riveted lap-joint while flying above 34, 000 feet (just over 10, 000 metres) with 118 passengers on board.

ECONOMIST: Aircraft fatigue