If you describe an amount, especially the cost of something as astronomical, you are emphasizing that it is very large indeed.
例句
Houses in the village are selling for astronomical prices...鄉村的房價正在飆升。The cost will be astronomical.費用將是一筆天文數字。
ADJ
天文學的；天體的
Astronomical means relating to astronomy.
例句
...the British Astronomical Association.英國天文協會
英漢詞典釋義
adj.
天文學的,天體的
He was an expert on ancient Chinese astronomical literature.他是研究中國古代天文學文獻的專家。Light-year is an astronomical unit.光年是一個天文單位。He was an expert on ancient Chinese astronomical literature.他是研究中國古代天文學文獻的專家。
極大的
￡200 was an astronomical sum of money in 1547.在1547 年，200 英鎊可是一個天文數字。
英英詞典釋義
Adjective
1. relating or belonging to the science of astronomy;