“低水平”用英语怎么说

我部门对维持低水平开支有浓厚兴趣。My department had a healthy interest in keeping expenses down.能源价格一直维持低水平，所以能源利用效率很低。Energy prices have been kept low, so energy is used inefficiently.近来这个班的成绩一直处于较低水平.The work of this class has been fal...