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304.athlete.c运动员; 305. burnout.n燃尽; 306.flaw.n缺点; 307.outcome.n结果; 308.reinforcement.n加强; 309.drought.c干旱; 310.by-product.c副产品; 311.irrigation.n灌溉; 312.depressions.n凹地; 313. popularity.n普及, 流行, 声望; 314.brand.c商标; 315.decline.n/v衰退; 316.backpack.c背包; 317.market .n市场; 318.modification.n更改，修正; 320.marketing.n市场营销; 321.pollution-free免于污染; 322.congestion.n拥挤; 323.buzzer.n蜂鸣器; 324.code of behaviour行为准则; 325.confrontation.n冲突; 326.saboteur.c阻拦者; 327.graying泛灰; 28.baby boom生育高峰; 329.Gerontology老年学; 330.discrimination.n歧视; | 
