This feature decides the granitic rocks have positive buoyancy and the long history records of the earth's evolution.
这种性质决定了花岗质岩石具有正的浮力，记录了很长的地球演化历史。
This versatile rescue device is extended by hand. As an ice rescue device, it provides positive buoyancy to the victim and patient head protection during extrication.
这种救护吊索有多种功能，作为冰川的救护装置，可以为伤员提供提升力，在救护的过程中保护病人的头部。
The surface tension, arc blow force and electromagnetic force work positive to improve the penetration, and the buoyancy can increase the width in the middle of weld pool.
表面张力、电弧吹力和电磁搅拌力均有利于获得较大的熔深，浮力有利于增加焊缝中间部位的宽度。
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