n.平面;实音;
例句:
Notice the flatness and the rich, red earth.
注意那平坦的地势和肥沃的红土地。
The ground should be solid flatness, the pump put should steady really.
地面应坚实平坦, 泵安放应平稳着实.
Juliet's voice held the flatness of defeat.
朱丽叶的声调因挫折而无精打采.