gravity

火箭正在克服地球引力。

The rocket is overcoming the earth's ___gravity.

他带着严肃的语气谈论了公司的财务危机。

He spoke with ___gravity about the company's financial crisis.

由于缺少重力，航天员的骨骼和肌肉在太空中会变得非常虚弱。

Astronauts' bones and muscles can get very weak in space due to the lack of ___gravity.