?muscle是指人體內的肌肉組織，它是由肌纖維組成的，具有收縮和伸展的能力，可以幫助身體進行運動和保持姿勢。除了在人體內起著重要的生理作用外，在語言中也常被用作比喻，表示力量、實力或影響力。

muscle這個詞源于拉丁語musculus，意為“小鼠”，因為古時候人們認為肌肉像老鼠一樣活躍。它的復數形式為muscles。

在日常生活中，我們經常使用muscle來描述身體部位。比如：

1. He has strong muscles from lifting weights at the gym.（他因為在健身房舉重而擁有強壯的肌肉。）

2. The athlete pulled a muscle while running and had to s the race.（這位運動員在跑步時拉傷了肌肉，不得不停止比賽。）

3. My back muscles are sore from sitting at my desk all day.（我整天坐在桌子前，背部肌肉很酸痛。）

此外，在醫學領域也經常使用muscle來指代特定的部位或類型的肌肉。比如：

4. The doctor examined his leg muscles and found no signs of injury.（醫生檢查了他的腿部肌肉，沒有任何受傷的跡象。）

5. The heart is a muscle that pumps blood throughout the body.（心臟是一種肌肉，它將血液泵送到全身。）

除了指代具體的身體部位外，muscle也可以用來形容力量、實力或影響力。比如：

6. The company used its financial muscle to acquire its compes.（這家公司利用其財務實力收購了競爭對手。）

7. She flexed her political muscles and got the bill passed.（她發揮她的影響力，使法案通過了。）

8. The team showed their mental muscle by overcoming a tough opponent.（這支球隊通過戰勝強大的對手展示了他們的心理實力。）

總的來說，muscle是一個多功能的詞匯，在不同場合下可以有不同的含義和用法。

例句參考：

1. I can feel the muscles in my arms getting stronger from lifting weights every day.

（我能感覺到每天舉重使我手臂的肌肉變得更強壯。）

2. The dancer's graceful movements showed off her well-toned muscles.

（舞者優美的動作展示了她結實健美的肌肉。）

3. He pulled a muscle in his neck while playing tennis and had to take a break from the game.

（他在打網球時頸部拉傷了一塊肌肉，不得不暫時休息比賽。）

4. The doctor recommended physical therapy to help strengthen the muscles in her injured leg.

（醫生建議進行物理治療來幫助加強她受傷的腿部肌肉。）

5. The company's financial muscle allowed it to expand into new markets and increase its profits.

（這家公司的財務實力使其能夠擴張到新市場并增加利潤。）

隨機例句：

1. He was a man of great muscle, able to lift heavy objects with ease.

2. The boxer showed off his impressive muscles during the weigh-in before the fight.

3. She strained a muscle in her back while moving furniture and had to take a few days off work.

4. The politician used his political muscle to push through controversial legislation.

5. The team's coach emphasized the importance of mental muscle as well as physical strength in their training sessions.