1. Flatness can be determined by covering a surface with an optically flat glass. ��һ��ѧƽ�沣������һ�����棬���Բ���ƽ���ȡ�
2. Thomas Hudson looked out at the flatness of the blue sea and the darker blue of the Gulf. ����˹���յ�ɭ������տ���ĺ��棬����ˮƽ�羵���ں����Ƕ�����������һƬ�ˡ�
3. The control of thin strip and foil flatness, or shape, inevitably requires some degree of modelling. �����ĺͲ��ĵ�ƽֱ�Ȼ���ο��Ʊ�ȻҪ��һ���̶ȵ�ģ�ͻ���
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n.
1. the property of having two dimensions
2. a want of animation or brilliance
3. a deficiency in flavor
4. the property of having little or no contrast; lacking highlights or gloss
5. inactivity; showing an unusual lack of energy