problematic: adj. involving problems and difficult to deal with

搭配

• ~ + n: aspect, nature, situation
• adv + ~: highly, increasingly
• ~ + prep: to, for

翻译

对中国学生来说，英语中的双元音（diphthong）很难掌握。
Mastering English diphthongs can be quite problematic for Chinese students.

造句

句子： After years of research, AIDS remains problematic to human beings.
翻译： 经过了这么多年的研究，艾滋病对人类来说仍然是个问题。
场景： 医学。

句子： As a programmer, I am fixing problematic codes even on New Year’s Eve.
翻译： 作为码农，我跨年夜的时候还在修复有问题的代码……
场景： 苦逼的程序员……