『新东方在线托福听力』为托福考生准备了ETS托福TPO/【学术讲座】#53听力练习：What is the purpose of the talk?原文题目答案解析，TPO/【学术讲座】#53听力原文范文音频翻译。

托福TPO/【学术讲座】#53听力原文What is the purpose of the talk?【新东方在线】

男：我们一直在讨论惯性定律。

M: We've been talking about the law of inertia.

一个沿直线运动的物体，除非受到另一力的作用，否则将继续沿直线运动。

An object moving in a straight line will continue to move in a straight line unless it is acted upon by another force.

那么这在现实世界中意味着什么呢？

So what does this mean in the real world?

我们来看看很多人一直都在做的一件事：骑自行车。

Let's look at something many people do all the time, riding a bicycle.

Think about riding along in a straight line.

一旦自行车开始运动，惯性会使它保持直线行驶。

Once the bike is moving, inertia will keep it going in a straight line.

但我们并不只是直线骑行，对吧？

But we don't just ride in straight lines, do we?

我们在拐角处转弯，并绕过挡在我们路上的东西。

We turn at corners and steer around things that are in our way.

那么，你如何让自行车不直行呢？

So how do you get the bicycle not to go straight?

很简单，对吧？难道你只需要将前轮转向你想转的方向不就行了吗？

Easy, right? Don't you just need to turn the front wheel in the direction you want to turn?

事实上，如果你只转动前轮，你很可能会摔倒在人行道上。

In fact, if you only turn the front wheel, you're likely to end up on the pavement.

前轮会转，但由于惯性，你的身体和自行车的其余部分会想要继续向前直行。

The wheel will turn, but because of inertia, your body and the rest of the bike will want to keep moving straight ahead.

那么骑车人如何避免这种情况呢？关键是向转弯方向倾斜。

So how does a cyclist avoid this? The key is to lean in.

重心需要向转弯方向移动，这样重力才能对抗惯性力。

Weight needs to shift in the direction of the turn so that the force of gravity can work against the force of inertia.

高速骑行的专业自行车手需要找到一个最佳平衡点：倾斜更多以防止自行车在转弯时打滑，但又不能倾斜过度。

Professional cyclists who move at high speeds need to hit a sweet spot, lean more to keep their bicycles from sliding out of turns, but not too much.

在某个临界点，重力会把骑手和自行车一起拉倒在地上。

At a certain point, gravity will bring both rider and bicycle down to the ground.

What does the speaker suggest about turning?

What does leaning in help a cyclist to do?

What do professional cyclists try to do when turning?

Listen to talk in a physics class. M: We've been talking about the law of inertia. An object moving in a straight line will continue to move in a straight line unless it is acted upon by another force. So what does this mean in the real world? Let's look at something many people do all the time, riding a bicycle. Think about riding along in a straight line. Once the bike is moving, inertia will keep it going in a straight line. But we don't just ride in straight lines, do we? We turn at corners and steer around things that are in our way. So how do you get the bicycle not to go straight? Easy, right? Don't you just need to turn the front wheel in the direction you want to turn? In fact, if you only turn the front wheel, you're likely to end up on the pavement. The wheel will turn, but because of inertia, your body and the rest of the bike will want to keep moving straight ahead. So how does a cyclist avoid this? The key is to lean in. Weight needs to shift in the direction of the turn so that the force of gravity can work against the force of inertia. Professional cyclists who move at high speeds need to hit a sweet spot, lean more to keep their bicycles from sliding out of turns, but not too much. At a certain point, gravity will bring both rider and bicycle down to the ground.

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