Equally frustrating is the opposite extreme, where a driver sits at a red light for minutes even though there's no car in sight to take advantage of the intersecting green.
相反的情况同样令人沮丧，当绿灯通行方向没有任何车辆时，一个驾驶者却要在另一方向的红灯前等待数分钟。
In addition, it is quite common for some species to take on a different leaf colour (usually changing from green to red) when about to flower.
另外，一些种类的叶子会变化不同的颜色是十分常见(通常由绿变红)，当将要开花的时候。
Red was for dangerous and uninhabitable buildings, yellow to warn residents to take caution when entering and green for safe structures.
白色表示危险和不能寓居的修建，黄色是正告居民进入时要小心而绿色则表示构造平安。
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