When you see the apple, your brain's motor center activates the appropriate muscles, allowing you to reach out with your arm, grab it with your hand, bend your elbow joint, and bring it to your mouth.

当你看见苹果，大脑的运动部分激活合适的肌肉，使你伸出手臂，用手抓住它，弯曲手肘，把它送到你嘴中。