(a) As has been mentioned, some postulated that phlogiston has negative weight (levity).
(a) 正如所提到
那样,某些燃素会减轻(轻率)

。
(a) As has been mentioned, some postulated that phlogiston has negative weight (levity).
(a) 正如所提到
那样,某些燃素会减轻(轻率)

。
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