Use a heavier rope to fasten an inflated balloon, heavier enough to resist the buoyance of the balloon in order to keep it still in the air.
用粗一些的绳子绑住气球，减掉一段使剩余的绳子重量刚好能够承载气球的上升力，以达到气球稳定漂浮在空中。
The driving force of primary migration is mainly abnormal high pressure and that of secondary migration is buoyance and fluid potential difference.
初次运移的动力主要是异常高压，二次运移的动力主要是浮力和流体势差。
The driving force of primary migration is mainly abnormal high pressure and that of secondary migration is buoyance and fluid potential difference.
初次运移的动力主要是异常高压，二次运移的动力主要是浮力和流体势差。
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