Biologically speaking , man was not designed to fly this high .

从生物学角度来讲，人类不适合在那样的高度飞行。

Saliva of medical leeches is a balanced complex of biologically active substances .

医用水蛭的唾液是一种生物活性物质的均衡复合物。

Biologically speaking , that looks odd .

从生理上来说，这看起来非常奇怪。

It 's highly unlikely that you 're biologically related .

那你很可能不是亲生的。

And the drive to expand grazing land destroys more biologically sensitive terrain , rain forests especially , than anything else .

同时，扩张牧场的驱动比其他任何原因，破坏更多的生态敏感地区，尤其是热带雨林。