n.[U]

1. 平坦
   The flatness of the roads made the rest of their trip more comfortable.

   道路的平坦使他們剩下的路程舒服多了。

2. 單調；乏味
   The children were bored by the flatness of the long winter night.

   漫長冬夜的單調使孩子們感到乏味。

3. 斷然的態度
   You could sense the flatness in his tone when he said 'no'.

   當他說"不"時，你可以覺察到他的斷然態度。

4. 【機】真平度；平面度