?thin是一個英文單詞，意思是“瘦”的意思，形容人或物體的體型纖細或者薄弱。

用法：

thin這個詞可以作為形容詞、動詞和名詞使用。作為形容詞時，它可以修飾人或物體；作為動詞時，它可以表示使變得瘦弱；作為名詞時，它可以指代瘦的人或物體。

例句1-5句且中英對照：

1. She is very thin and can easily fit into small clothes. (她非常瘦，能夠輕松穿上小號的衣服。)

2. The paper is so thin that it tears easily. (這張紙太薄了，很容易撕裂。)

3. He has been trying to lose weight and become thinner. (他一直在努力減肥，變得更加苗條。)

4. The air in the high mountains is very thin, making it difficult to breathe. (高山上的空氣非常稀薄，讓呼吸變得困難。)

5. She has a thin face and long, slender fingers. (她有著瘦長的臉和修長的手指。)

同義詞及用法：

1. slim：指身材苗條、輕盈。

例句：She has a slim figure and looks great in that dress. (她身材苗條，在那件裙子里看起來很漂亮。)

2. skinny：指瘦弱、消瘦。

例句：He used to be skinny, but now he has gained some weight. (他以前很瘦弱，但現在已經有些胖了。)

3. lean：指體型勻稱，肌肉發達。

例句：He is very lean and muscular from working out regularly. (他經常鍛煉，身材非常勻稱和肌肉發達。)

4. slender：指細長、纖細。

例句：She has a slender waist and delicate features. (她有著纖細的腰身和精致的五官。)

5. emaciated：指因饑餓或疾病而消瘦。

例句：The prisoners were emaciated after months of starvation in the concentration camp. (集中營里的囚犯們因為數月的饑餓而消瘦不堪。)