Դȷ˷λ漴Сӿ˽Ų
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һ̣ΪʲôѧԺۼôˣȻЩ˶ġ
ֻǣЩ⣬ѧԺʲôʱһȺС飿
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һʱûмͼƣжʱļ֮ǰսҲdz˲٣ѹеļЩʵʦѧԺôо飿
ŶզѧԺסģʱͻؾ֮ɭͼ˵ЩͼƵ˾Ȼδ꾫飬ԭļƻЩδľȳ˹Ͻؾ壬аijñ˹òıƻ
˹ȴаڷؾ壬Ͼа壬ôҲҪʾʾʱ˹뿪ˣǵõĽˡ
ֹDZ˹ӰӴ˿̶ǹѧԺסΪҲǶѧԺģⲻԶҲûǹַԺҲʱʱĻǹַԺ(δ)
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