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历史:
TOEFL GRE BNC: 9591 COCA: 6692
bolsterbolsterD.J.:[ˈbəulstə]K.K.:[ˈbolstɚ]vt.1.给予必要的支持, 鼓励n.1.长枕, 垫枕He used a couple of bolsters to elevate his head.他用两个垫枕垫头。

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