0 the quality of being level and without curved, high, or hollow parts -- 平坦
1 the fact that someone or something shows no emotion or interest -- 平淡；乏味
All the critics remarked on the flatness of the performance. 所有的评论家都谈到这场表演平淡乏味。
The same applies to flatness, since an abelian group is torsion-free if and only if it is flat.
Such surfaces are usually machined or ground to achieve the required degree of flatness.
Later, the flatness of the land was broken up by regular sandridges, running in an east-west direction.
The n-dependence (n is the order of derivative) of the flatness factor, minus three for derivatives of the velocity field, shows a rapid increase with n in this stage.
The flatness factor increases steadily with decreasing separation.
However, it is very natural to assume this type of results (flatness implies regularity) to be satisfied for the equation (2.9) with the free boundary condition u ?
Also, flatness is preserved after multiplication by a smooth function (or dividing by a non-vanishing smooth function).
Many of us remember that curious sense of emptiness and even flatness.
