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Dioptra的音标发音
Dioptra
英式发音：[dai'ptr]
美式发音
(n.) An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
编辑:米兰达
(n.) An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
编辑:米兰达