In this eclipse, the Observatory is slightly off the track of annularity ( by 10 km ).这次日食中, 天文台于 环食 带10公里外....

n.环状，轮状...

annularity的音标：annularity的英式发音音标为：[ænjʊ'lærɪtɪ]annularity的美式发音音标为：[ænjʊ'lærɪtɪ]...