knotty例句分享

　　This is a knotty problem.

　　這可是件讓人撓頭的事

　　Writing is always a knotty problem in English teaching.

　　寫作向來是英語教學中的一個難點。

　　The chemistry is knotty for me.

　　化學對我來說是很復雜難懂的。