Elementary, Intermediate, Upper Intermediate English.
初级，中级，中高级英语。
The level was usually quite high - upper intermediate 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。
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.
外壁由几层组成：上部均质层，具不平的外、内表面，中间均质层，穴状层和下部均质层。
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。
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。
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