trouble

1.最困扰很多二线城市的是人才的短缺。

Many second-rate cities are most troubled by the lack of talent.

参考：What troubles many second-tier cities the most is a shortage of talent.

2.在学习英语方面，困扰很多同学的就是单词量的不足。

With regard to learning English, many students are troubled by a shortage of words.

什么时候结婚一直困扰着她，这让她显得心神不宁。

When to marry has been troubling her, making her anxious.

3. 背诵

Many students today are constantly troubled by their inability to concentrate.

现在的学生经常会被无法集中注意力困扰。

Many international cities, say Los Angeles, Beijing, and New Delhi, are troubled by traffic congestion.

很多城市会被交通拥堵所困扰，比如洛杉矶，北京和新德里。