这种螺纹状的关节与球状关节相比，更难发生脱臼的情况。

It's much harder, they say, to dislocate a screw than a round-ball-and-socket joint.

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术后12周于大鼠胫骨处植入纯钛螺纹状种植体，并于种植术后4周及12周分两批处死大鼠；

Twelve weeks after surgery, pure screw titanium implants were placed in the proximal metaphyses of the tibiae of rats in both groups. The rats were killed at 4 and 12 weeks after implant surgery.

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最后用螺纹状的瓶塞密封瓶口，不让任何气泡跑出，然后放入冰箱冷藏四天，不要长于这个时间。

And then finally, seal the bottle with a screw top so none of the bubbles can get out, and then stick it in the fridge for 4 days, but no longer.

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