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seldom ad.很少 select vt.选择，挑选 a.选择的，精选的 selection n.选择，精选的人或物 self n.自己，本身；私心 selfish a.自私的 sell vt.卖，出售；出卖，背叛 vi.卖，销售 semester n.学期 semiconductor n.半导

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