su·per·ses·sion /ˌsupɚ/
取代,更?,廢棄
Su·per·ses·sion n. The act of superseding, or the state of being superseded; supersedure.
The general law of diminishing return from land would have undergone, to that extent, a temporary supersession. --J. S. Mill.
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supersession
n : act of replacing one person or thing by another especially
one held to be superior [syn: supersedure]