hour-circle时圈
An Hour Economy Circle一小时经济圈
one hour economic circle一小时经济圈
one-hour economic circle一小时经济圈
one-hour commuting circle一小时通勤圈
hour circle of vernal equinox春分点时圈
one-hour city economic circle小时城市经济圈
N（名词） a great circle on the celestial sphere passing through the celestial poles and a specified point, such as a star 时圈