这需要极大的努力，但是值得，因为它们都是世界顶级的结组线路。

That's a lot of effort, but worth it because these are world classics.

youdao

第二组测试者收到的是用棕色纸包装的没有蝴蝶结的礼品。

A second group was given packages wrapped with brown paper and no bow.

youdao

第二组测试者收到的是用棕色纸包装的没有蝴蝶结的礼品。

A second group was given packages wrapped with brown paper and no bow.

youdao