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词汇 cross-hair
释义 cross-hair 英k'rɒsh'eər美k'rɒsh'eər COCA³¹⁵¹¹¹⁺
基本英英
n.叉丝¹⁰⁰

名词 cross hair:
either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration
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