常见例句用作名詞 (n.)The tropical year is a phenomenon of the precession of the equinoxes in astronomy.太陽年是天文學裡的嵗差現象。A tropical year is a measurement of time from one winter solstice to the next.廻歸年是指從一年鼕至到下一年鼕至的時間段。 返回 solar year