concaving的音標是["k?n,ke?v??]，意思是凹陷的、凹下的。

速記技巧：可以嘗試使用字母縮寫法來記憶這個單詞，其中c、k、v可以縮寫為“克克夫”，可以更快地記住這個單詞。

Concaving這個詞的詞源可以追溯到拉丁語concavitas，意為“凹陷、凹形”。它的變化形式包括名詞的concavity和形容詞的concave。

相關單詞：

1. Convexity（凸起、凸面）和concavity（凹陷、凹面）是一對反義詞，都與形狀有關。

2. Concave lens（凹透鏡）是一種常見的光學元件，常用于放大圖像或改變光線方向。

3. Conchology（貝殼學）是一門研究貝殼結構的學科，其中concavity（貝殼的凹面）是其中一個重要的研究內容。

4. 地質學中的concavity（凹陷、凹形）常常與地形的變化有關，如海蝕崖等。

以上這些單詞都與concaving這個詞有著密切的聯系，通過它們我們可以更好地理解這個詞的含義和用法。同時，這些單詞也反映了英語詞匯的豐富性和多樣性。

常用短語：

1. concave lens

2. concave mirror

3. concavity

4. concave surface

5. in concavity

6. towards concavity

7. into concavity

雙語例句：

1. The lens is formed with a concave surface. (該透鏡形成于凹面。)

2. The mirror is concave and has a diameter of 50 mm. (該鏡子是凹面的，直徑為50毫米。)

3. The surface of the object is in concavity of the lens. (物體的表面在透鏡的凹面內。)

4. The light beam is directed towards concavity. (光束被指向凹面。)

5. The object is placed into concavity of the lens. (物體被放置在透鏡的凹面內。)

6. The lens has a concave lens and a convex lens. (該透鏡具有凹透鏡和凸透鏡。)

7. The concave mirror reflects light in a certain direction. (凹面鏡反射光線于某一方向。)

英文小作文：

Title: The Magic of Concave Mirrors

Concave mirrors are a fascinating optical device that can create some amazing effects in our lives. When we look into a concave mirror, we see our reflection distorted, making us look taller or thinner than we actually are. This is because the light bends as it passes from a straight path to a curved surface, resulting in a different perspective of our appearance.

In science, concave mirrors are commonly used in microscopes and telescopes to magnify and observe objects that are far away. By bending the light, the concave mirror helps to collect more light and reduce the amount of distortion, making it easier to see details and patterns that were previously invisible.

Beyond science, concave mirrors have also been used in various artistic and decorative applications, such as in jewelry design and art installations. They can create unique and beautiful patterns and shapes that add a touch of magic and mystery to any space.

In conclusion, the magic of concave mirrors is not only in their optical properties but also in their ability to transform and enhance our world in unique and unexpected ways.