What is 'a sing-along medley'?
In the sentence below:

Australia – the sixth-largest country on this lonely planet – is dazzlingly diverse: a sing-along medley of mountains, deserts, reefs, forests, beaches and multicultural melting-pot cities.

What does ' a sing-along medley' mean?

Question

What is 'a sing-along medley'?
In the sentence below:

Australia – the sixth-largest country on this lonely planet – is dazzlingly diverse: a sing-along medley of mountains, deserts, reefs, forests, beaches and multicultural melting-pot cities.

What does ' a sing-along medley' mean?

Answer

It's a poetic way to say that all its landscapes - mountains, deserts, etc. - work together just like songs fitted together. The 'sing-along' part means that you get drawn into it, involved with it. 
I hope that helped, I'm not the best at explaining things! :)

Answer

Please forgive me wiriting in Chinese.

澳大利亚是世界上国土面积第六大的国家，孤独地呆在这个星球上(Hope I didn't change its meaning.)，但其实它却是个相当多样化的国家，有高山、沙漠、珊瑚(沙洲 I don't know which is the best word.)、森林、海滩，还有文化大熔炉的城市，就像一部欢快的歌曲大串烧。

感觉像是一本相当有水平的旅游杂志。

Đừng bỏ lỡ cơ hội học ngoại ngữ ngay tại nhà. Hãy xem danh sách các gia sư ngôn ngữ giàu kinh nghiệm của chúng tôi và đăng ký buổi học đầu tiên ngay hôm nay!