The course is suitable for students with an upper-intermediate level of English.
本课程适合具有中级以上英语水平能力的学员。
2
The level was usually quite high - upperintermediate or advanced.
所练习的水平也是相当地高，一般可以达到中级以上甚至高级水平。
3
It consists of the following layers: the upper homogenous layer, with uneven external and internal surfaces, the intermediate homogenous layer, the alveolate layer, and the lower homogenous one.