a. 红的, 红色的, 红肿的, 流血的 n. 红色, 红颜料, 赤字
The red and green automatic traffic light system originated in an American city.
六级 · CET-6 2025年12月 第3套
Even though a green light signals "go", attention should be paid to traffic on either side in case some driver is being careless or ignoring a red light.
六级 · CET-6 2025年12月 第3套
In Los Angeles, California, an ambitious project to go a step further and synchronize every red light in Los Angeles cost over 400 million dollars.
六级 · CET-6 2025年12月 第3套
The railroads used red gas lights at night to signal stops and green gas lights during the daytime.
六级 · CET-6 2025年12月 第3套
The officer would flip a switch to change between the dipped red and green lights.
六级 · CET-6 2025年12月 第3套