This side here is a usual double integral in the plane.
这边是平面上普通的二重积分。
Double car depot construction management a plane has special about the depot, worth summary.
双层车辆段建设管理较平面车辆段有特殊之处，值得总结。
Passengers now have to go through double screening before getting on their plane.
现在乘客要通过双重检查才能登记。
Passengers now have to go through double screening before getting on their plane.
现在乘客要通过双重检查才能登记。
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