n.噴出；上噴；上升流
動詞upwell的現(xiàn)在分詞形式.
Eventually, currents and upwelling from the depths bring the dead stuff back to the top, where it stimulates more phytoplankton growth. 最終，來自深層的水流和上升流會將死物質(zhì)帶到表層，并刺激更多的浮游植物生長。
