Muscles
肌肉
Where would we be without muscles? 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 specific 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 frown than it does to smile. This means smiling uses less energy, so we should do it more.
如果没有肌肉,我们会是什么样子?地板上可能一片狼藉。肌肉是很有趣的东西。每个人都有很多肌肉。有些人比其他人更会照顾肌肉。健美运动员想拥有真正的大肌肉,越大越好。他们花几个小时在健身房举重,使他们的肌肉尽可能变大。运动员锻炼他们运动所需要的特定肌肉。如果你观察一个百米跑者,你会发现他们的肩膀和手臂肌肉很粗壮。这样他们在跑步时就能向前冲。关于肌肉的一个有趣的事情是,皱眉比微笑需要调动更多的面部肌肉。这意味着微笑消耗的能量更少,所以我们应该多微笑。