Flatness
n. 平坦, 平滑\\n[化] 平直度; 平整度; 平面度
📖 牛津释义
flatness
n [U].
🗣️ 情景例句
His appearance is impressive.
他的外表给人印象深刻。
I'm twenty-one years old.
我21岁。
Fine, thank you, Li Lei. How are you?
我很好，谢谢。你呢？