In the Middle Ages, troubadours and Arthurian tales recast that longing as "courtly love", a fierce, often forbidden devotion like Lancelot's for Guinevere, in which a knight proved his worth through self-sacrifice for a beloved he might never openly declare.
甚至还有一些讲究「降本增效」的防窥膜，只蚀刻纵向光栅，导致只能左右防窥、上下或者斜视看过去依然是一览无余的：
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CTC (English, punctuation & capitalization):。同城约会是该领域的重要参考
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