flatness 的音標是 [?fl?tn?s]，基本翻譯是扁平度。速記技巧可以考慮使用發音類似的單詞來幫助記憶，例如使用“發落尼斯”來進行記憶，這樣在聽到單詞時可以更容易地拼寫出來。

Flatness這個詞的英文詞源可以追溯到拉丁語flatus，意為“被沖淡的”或“平坦的”。它的變化形式包括過去式flat-“使平坦”，過去分詞flatus或flatus“已經平的”以及現在分詞flattening“使平坦化”。

相關單詞：

1. Flatiron - 鐵平（鐵板）

2. Flatten - 使扁平化（使變平）

3. Plane - 平的（平面）

4. Level - 水平的（水平線）

5. Flattened - 平坦的（被壓平的）

6. Flattening agent - 增平面團（增平面團添加劑）

7. Leveler - 平整器（平整工具）

8. Platter - 平盤（扁平盤子）

9. Flattened out - 平坦地展開（被平展）

10. Flatland - 平面的世界（二維世界）

以上這些單詞都與flatness這個詞有直接或間接的聯系，體現了其豐富的詞義和用法。flatness這個詞在描述物體的平坦程度時非常有用，同時也反映了人類對于平坦和平面的追求和向往。

常用短語：

1. flatness of surface

2. flat out

3. be flat-footed

4. flat-out refusal

5. flat tire

6. flat rate

7. flat affect

雙語例句：

1. The surface of the table is very flat.

2. We"re flat-out exhausted after the long journey.

3. He gave a flat-out refusal to cooperate with us.

4. The tire was flat and we had to stop for repairs.

5. We have to maintain a flat tax rate to attract investment.

6. She has a flat affect and doesn"t show much emotion.

英文小作文：

Flatness is an essential quality in many fields, from architecture to art, and even in our daily lives. It can be seen in the smoothness of a tabletop, the evenness of a road, or the lack of emotion in someone"s face. Without flatness, things would be chaotic and disordered, and life would be much more difficult.

On the other hand, flatness can also be a source of frustration and disappointment. When a tire goes flat, we have to stop and replace it, which can be inconvenient and time-consuming. Similarly, when someone has a flat affect and doesn"t show much emotion, it can make it difficult to connect with them on an emotional level. However, this lack of emotion can also be a source of strength and stability, providing a foundation for others to build upon.

In conclusion, flatness is both a blessing and a curse. It can bring order and stability, but it can also create challenges and difficulties. Nevertheless, we must learn to embrace it and use it to our advantage, realizing its potential and limitations at the same time.