weightlessness
US /ˈweɪt.ləs.nəs/
UK /ˈweɪt.ləs.nəs/
1.
không trọng lượng
the state of having or appearing to have no weight; the fact of not being affected by gravity (= the force that makes things fall to the ground):
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The animals will be used to study the effects of weightlessness on the brain and nervous system.