Doors of hollow core, even when locked, are vulnerable to break-ins.
空心门，即便锁上了，也易遭贼侵入。
The riser's inner hollow core (a pipe within a pipe) is reserved for the drill string.
立管内部核心是空心的(管中管)，留给钻柱使用。
Hollow core was linked with hydraulic loose-core implement fixed on the moving die.
空心型芯与固定在动模上的液压抽芯器相连。
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