1. Imagine a pen attached to the weight in such a way that its point rests upon a piece of paper on the floor. Imagine an earthquake shock shaking the floor, the paper, you and your hand.
    假定把一支笔拴在重物上，笔尖落在地板上的一张纸上，假定地震发生了，地板、纸、你和你的手都会动，重物和笔都却不运动。

2. In the midst of all this movement, the weight and the pen would be still.
    在这些所有的运动中，重物和笔却不动。

3. I have never been good at guessing weight, but I know Sam feels awfully heavy when I carry him around the city all day.
    我从不擅长猜测体重，但我知道我整天抱着他在街上走时感觉他非常重。