His jet needed no propellers. It was a tube, open at both ends.
他的喷气流不需要螺旋桨，而是由一个两端开口的管子来实现。
Open re-circulating cooling water shall be on the tube side of the cooler.
敞式循环冷却水应在冷却器的管程内。
The expanded tube is thin wall casing with open mouth.
胀管为开口薄壁套管；
The expanded tube is thin wall casing with open mouth.
胀管为开口薄壁套管；
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