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The training or occupying from the thoughts, esp. the knowledge, in an active way; engagement in mental motion or action: see many senses of…A puzzling or perplexing query; a hard difficulty; a one who or thing which happens to be tricky to be familiar with, an enigma.知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现�