Teachers are accused of levelling standards down to suit the needs of less able students.

有人指责教师降低标准以适应学习较差学生的需要。

It was all down, down, down, gradually—ruin and levelling and disappearance.

一切都在往下沉，往下沉，往下沉，渐渐地——毁灭了，夷平了，消失了。

Remove switch for headlight levelling system.

拆下前照灯调平装置开关。

Install switch for headlight levelling system.

安装前照灯调平系统开关。

The AIDS epidemic in Tanzania is levelling off!

在坦桑尼亚的艾滋病疫情趋于稳定！