Cross hair
volume
British pronunciation/kɹˈɒs hˈeə/
American pronunciation/kɹˈɔs hˈɛɹ/

Định Nghĩa và Ý Nghĩa của "cross hair"

Cross hair
01

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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