It's not fair!
真不公平!
What's not fair?
什么不公平?
I was rereading the Constitution of the United States. It says here that “All people are created equal.”
我又讀了一遍《美國憲法》,上面寫著:“人人生而平等。”
That's just not true!
事實并非如此!
What do you mean?
你想說什么?
Well, it's always being my dream to become the Olympic champion in the 100-meter-dash.
成為奧運會的百米短跑冠軍一直是我的夢想。
But no matter how hard I train, I'm just not fast enough.
可是,無論我多么努力,我就是跑不了那么快。
You just realizing this now.
你才意識到啊!
Some guys are simply faster than everyone else.
有些人就是比別人都跑得快。
That's because some people are born with more faster twitch muscle fiber than others.
那是因為他們天生比他人多快收縮肌纖維。
With what?
有更多什么?
That's a big part of what make people faster than others.
快收縮肌纖維大大地決定了跑步速度。
Muscles are made of two kinds of fibers–fast twitch and slow twitch.
肌肉有兩種纖維構成:快收縮肌肉纖維和慢收縮肌肉纖維。
What's the difference?
有什么不同嗎?
Slow-twitch fibers use energy aerobically and can work for long periods of time before getting tired.
慢收縮肌肉纖維用于有氧耗能,適合耐力性運動。
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