他的成绩下降让老师们感到担忧。

His decline in performance worries the teachers.

由于生病，他最近的成绩下降了。

Due to illness, he has had a recent decline in performance.

这个学期他的成绩下降得很明显。

His decline in performance this semester is very noticeable.

我们需要找出她成绩下降的原因。

We need to find out the reason for her decline in performance.

他们正在研究如何防止学生的成绩下降。

They are studying how to prevent students' decline in performance.

结果，他经常生病，成绩下降。

As a result, he often fell ill and his grades dropped.

他因为网瘾而成绩下降。

His grades dropped because of Internet addiction.

小明因为厌学，成绩下降了。

Xiaoming's grades have dropped because he is weary of studying.

父母离异可能会导致孩子的学业成绩下降。

Parental separation can lead to a decline in a child's academic performance.

家庭因素是导致他成绩下降的原因之一。

Family factors are one of the reasons for his declining grades.