How Much Power Does The US President REALLY Have?
https://www.youtube.com/watch?v=uTHVcMP0pyM 1:35 that's a whole other kettle of fish.
Debunking clichés: Is striking typically French?
参考リンク
http://bridge-english.blogspot.jp/2011/12/blog-post_05.html まったく別の事態を英語でなんと言うか?
http://bridge-english.blogspot.jp/2013/05/blog-post_19.html 全然別物を英語でなんと言うか?
練習問題解答
a-4313 a different kettle of fish
b-4681 a whole other kettle of fish
b-5568 a different kettle of fish