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历史:
CET-4 CET-6 考研 TOEFL BNC: 5445 COCA: 7028
staircase
stair·case / 5stZr7kes ; 5steEkeIs /noun C
1. a set of stairs inside a building with its supports and the side parts that you hold on to〔建筑物内的〕楼梯

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