听一分钟英文：Muscles-肌肉

Where would we be without muscles¹? Probably a mess on the floor. Muscles are pretty interesting things. Everybody has lots of them. Some people look after them better than others. Bodybuilders want to have really big muscles. The bigger the better. They spend hours in the gym lifting weights to make their muscles as big as they can. Athletes work on the specific² muscles they need for their sport. If you look at a hundred-metre runner, you’ll notice they have large shoulder and arm muscles. This is so they can power ahead when they run. An interesting thing about muscles is that it takes more face muscles to frown³ than it does to smile. This means⁴ smiling uses less energy, so we should do it more.

1 muscles   

n.肌肉( muscle的名词复数 )；（操纵他人的）力量；权力；肌肉组织

参考例句：

• I must take some exercise and loosen up my muscles. 我必须活动活动使肌肉放松些。 来自《简明英汉词典》
• Gosh! My muscles is going to ache all over tomorrow. 哎呀！明天我全身肌肉都会痛了。 来自《简明英汉词典》

2 specific   

adj.明确的；具体的；特定的

参考例句：

• The money is to be used for specific purposes.这笔钱有专门用途。
• We haven't fixed a specific date for our meeting.我们会议的具体日期还没有定下来。

3 frown   

vi.皱眉，不满，用皱眉对…表示不满(at)

参考例句：

• Don't frown at me like that.不要那样对我皱眉。
• Her frown gave him a speechless message.她眉头一皱给了他一个暗示。

4 means   

n.方法，手段，折中点，物质财富

参考例句：

• That man used artful means to find out secrets.那人使用狡猾的手段获取机密。
• We must get it done by some means or other.我们总得想办法把它干完。