yǔ háng yuán / zài / shī zhòng / zhuàng tài / xià / píng héng jué / huì / shòu dào / hěn / dà / tiǎo zhàn

宇航员在失重状态下，平衡觉会受到很大挑战。

Astronauts' sense of balance is greatly challenged in weightlessness.