名词
中文翻译：平面
同义词：
['flat', 'planar', 'convex', 'concave例句：1. The flat surface of the table is smooth and easy to clean.（桌子的平面表面光滑且易于清洁。）']
例句：
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1. The flat surface of the table is smooth and easy to clean.
桌子的平面表面光滑且易于清洁。
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2. The convex shape of the lens focuses light in a specific direction.
透镜的凸面形状将光线聚焦在特定方向。
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3. The concave back of the cup makes it comfortable to hold.
杯子的凹背使其握持时感觉舒适。