Motion
动议
If a car, person, animal, or other thing is in motion, it is moving.
如果汽车、人、动物或其他东西在运动，它就是在运动。
Things move at different speeds.
事物以不同的速度移动。
A car moves fast.
汽车移动得很快。
A person moves slowly.
一个人动作缓慢。
Things move in different ways.
事物以不同的方式移动。
If you take the bus to school, you move quickly from your home to school.
如果你乘公共汽车去学校，你会很快从家到学校。
A train moves straight, but a train track can be curved.
火车直线行驶，但火车轨道可以弯曲。
Force makes things move or stop.
力使物体移动或停止。
Force can change the speed of things.
力可以改变事物的速度。
Pushes and pulls are forces.
推和拉都是力。
When you push an object, it moves away from you.
当你推一个物体时，它会远离你。
When you pull an object, it moves closer to you.
当你拉一个物体时，它会向你靠近。
A force that always pulls things down to the ground is gravity.
一种总是把东西拉向地面的力是重力。
When we drop an object, it falls because of gravity.
当我们放下一个物体时，它会因为重力而落下。