flatness

名词 flatness:

1. the property of having two dimensions
   同义词：two-dimensionality, planeness
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
   同义词：lusterlessness, lustrelessness, mat, matt, matte
5. inactivity; showing an unusual lack of energy
   同义词：languor, lethargy, sluggishness, phlegm

1. Not a single tree relieved the flatness of the plain.
   平原上单调得毫无变化，连一棵树都没有。