?hobby是指一個人平時喜歡做的，但并非主要職業或者必須做的事情。它通常是一種愛好、娛樂或者消遣活動，可以帶給人們快樂和滿足感。在英語中，hobby也可以用作形容詞，表示某件事情是由于興趣而進行的。

用法：

1. 作為名詞使用：My hobby is playing the guitar.

2. 作為形容詞使用：I have a hobby project to work on this weekend.

例句：

1. My hobby is painting, I find it very relaxing and therapeutic. (我的愛好是繪畫，我覺得它非常放松和治愈。)

2. She has a wide range of hobbies, including cooking, gardening, and photography. (她有很多愛好，包括烹飪、園藝和攝影。)

3. His hobby is collecting stamps from different countries. (他的愛好是收集來自不同的郵票。)

4. We share the same hobby of hiking, so we often go on trips together. (我們有相同的愛好——徒步旅行，所以經常一起出去旅行。)

5. Reading is not just a hobby for me, it's a way of life. (閱讀不僅僅是我的愛好，它更是一種生活方式。)

同義詞及用法：

1. interest：指對某件事情的喜愛或關注程度，比hobby更加寬泛。

例句：My main interest is photography, but I also have a few other hobbies.

2. pastime：指平時消遣娛樂的活動，比hobby更加輕松。

例句：Fishing is a popular pastime in this area.

3. leisure pursuit：指業余時間進行的有益的活動。

例句：Traveling is one of my favorite leisure pursuits.

4. avocation：指兼職或者業余從事的活動。

例句：Her avocation as a yoga instructor brings her joy and fulfillment.