除非你有很好的天文学知识，我并不懂天文学，那就很困难。

Unless you have a good knowledge of astronomy , which I do not, this is difficult.

youdao

除非你有很好的天文学知识，我并不懂天文学，那就很困难。

Unless you have a good knowledge of astronomy , which I do not, this is difficult.

youdao