weightless

1. ADJ Something that is weightless weighs nothing or seems to weigh nothing. 無(wú)重量的; 似無(wú)重量的

Photons have no mass – they are weightless. 光子沒(méi)有質(zhì)量——它們是沒(méi)有重量的。

2. ADJ A person or object is weightless when they are in space and the Earth's gravity does not affect them, so that they float around. 失重的

Helen described life in a weightless environment during her period in space. 海倫描述了她身処太空時(shí)失重狀態(tài)下的生活。