| 例句 |
The astronauts are living in a weightless environment. 航天员们生活在失重的环境里。Photons have no mass − they are weightless.光子没有质量，是失重的。Scientists used the space station to study physical phenomena in a weightless environment.科学家们用空间站研究失重环境下的自然现象。NASA has used the space shuttle to study how materials perform in a weightless environment.美国国家航空航天局利用航天飞机研究物质在失重环境中的表现。 |