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cross hair 或 cross·hair AHD[krôsʹhâr', krŏsʹ-] D.J.[ˈkrɔːsˌheə, ˈkrɒs-]K.K.[ˈkrɔsˌhɛr, ˈkrɑs-]n.（名词）- Either of two fine strands of wire crossed in the focus of the eyepiece of an optical instrument and used as a calibration or sighting reference.十字丝：呈十字形交叉于光学仪器的目镜焦点上的两根细丝之一，用于校准或瞄准参考
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