These experiments left little doubt that appropriate light changes could override signals from the biological clock . 这些试验使我深信不疑,适当的光照变化能够克服来自“生物钟”的信号。
I was crossing the street . lights changed on me 我当时正过马路灯正好变了颜色
The traffic lights changed from red to green 那个交通信号灯由红色变成绿色。
Don ' t start moving until the traffic lights change 直到交通灯号变换前不要开始移动。
The traffic lights changed from green to amber to red 交通灯从绿色变成琥珀色再变成红色。