From the street, only a single level of the house is visible.
从街上看来，住宅只有一层。
This simple, audio-visual method can only create single level submenu in the menu bar.
这种方法直观、简捷，仅限于制作菜单栏上的单级子菜单。
But it is a single-level evaluation model.
但它是一种单层次的评价模型。
But it is a single-level evaluation model.
但它是一种单层次的评价模型。
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