用白色蜡笔写我爱你拿黑色彩笔描我爱你
[yòng bái sè là bĭ xiĕ wŏ ài nĭ ná hēi sè căi bĭ miáo wŏ ài nĭ]
Translated as writing 'I Love You' first in white crayon and then outlining with black, it represents expressing deep feelings using two contrasting methods, implying purity and intensity in emotion.