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牛津3000核心词汇 柯林斯星级 ★★★★★ BNC词频 370 COCA词频 528

n. 事件, 物质, 原因, 素材, 实体, 重要
vi. 有关系

n. a vaguely specified concern
n. that which has mass and occupies space
n. a problem
n. (used with negation) having consequence

英汉双解字典由 ECDICT 提供