至于浮起沉下这种互相矛盾的效果，在两个法术共同时效内，后来者的效果覆盖前者。
求出处……………………
http://www.d20srd.org/srd/magicOverview/ca...stackingEffectsSame Effect with Differing ResultsThe same spell can sometimes produce varying effects if applied to the same recipient more than once. Usually the last spell in the series trumps the others. None of the previous spells are actually removed or dispelled, but their effects become irrelevant while the final spell in the series lasts.
One Effect Makes Another IrrelevantSometimes, one spell can render a later spell irrelevant. Both spells are still active, but one has rendered the other useless in some fashion.
Spells with Opposite EffectsSpells with opposite effects apply normally, with all bonuses, penalties, or changes accruing in the order that they apply. Some spells negate or counter each other. This is a special effect that is noted in a spell’s description.
