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