submersion
  下沈;淹沒;沈沒
  Sub·mer·sion n.
  1. The act of submerging, or putting under water or other fluid, or of causing to be overflowed; the act of plunging under water, or of drowning.
  2. The state of being put under water or other fluid, or of being overflowed or drowned.
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  submersion
       n 1: sinking until covered completely with water [syn: submergence,
             submerging, immersion]
       2: the act of wetting something by submerging it [syn: immersion,
           ducking, dousing]