The Australian National Flag has three colors: blue, red, and white. The color blue is the main color of the flag, while the color red is used only on the top left corner in the partial British flag. White is used in the stars.
如果是最简单，直接用以上那一段的第一句，中等可以用以上一整段。
高级用以下：
The flag of Australia is a defaced Blue Ensign: a blue field with the Union Jack in the canton (upper hoist quarter), and a large white seven-pointed star known as the Commonwealth Star in the lower hoist quarter. The fly contains a representation of the Southern Cross constellation, made up of five white stars – one small five-pointed star and four, larger, seven-pointed stars. There are other official flags representing Australia, its people and core functions of government.
