How many colors?
Apart from the green and white background, how many colors can you see?
有幾種顏色?
除了綠色和白色的背景,你還能看到幾種顏色?
It may look as if the two arms of the 'X' use different shades of pink,
but in fact the whole X only uses a single color.
How can this be true?
看上去組成“X”的兩條線段是由不同深淺的兩種粉色組成,但事實上,整個“X”只用了一種顏色
。這怎么可能?