The angular distance between two celestial bodies as seen from Earth. 距角從地球上看的兩個(gè)天體之間的角距離
Angular distance is the distance between two objects measured as an angle from a given point. 角距離，是由一定點(diǎn)到兩物體之間所量度的夾角。
The distance between the two rails of a railroad. 軌距鐵路兩根鋼軌之間的距離
The distance between one peak or crest of a wave of light, heat, or other energy and the next corresponding peak or crest. 波長(cháng)光、熱或其它能量波的一個(gè)波峰或波谷與下一個(gè)對應的波峰或波谷之間的距離
