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how, they ,winter, summer spend, care , dance , take, show , open , only, goodThe world of the out-of doors i... [查看全文]
other, move, enough, find ,desert, make, use , another, friend , carry , trouble, friendYou may think there is ... [查看全文]
before, discover , fast, in, come, watch , so, fast it, ago , shine, not canLight travels at a speed(速度) whi... [查看全文]