red-green color charts

例句：

1. 1. The red-green color charts are used to show the different shades of green.
   红色和绿色的色卡用来展示不同的绿色调。
2. 2. The color charts were helpful in identifying the different types of flowers.
   这些色卡在识别不同种类的花朵时很有帮助。
3. 3. The company uses color charts to help customers choose the right shade of paint.
   这家公司使用色卡帮助顾客选择正确的油漆颜色。