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Library Steps

1、书库便梯

...stratification 分层library steps 书库便梯scaling ladder 云梯 ...

2、图书馆用的小梯

相关词汇 ... a reference library （只供在内查阅，不供外借的）藏书楼，参考图书馆 library steps 图书馆用的（可折迭的）小梯 a walking library 活万宝全书（指博学的人） ...

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