By the way, the form " roses are red, violets are blue" is often used in English to make a joke about something by writing something funny for the last two lines of that particular poem.

顺便说一句， “玫瑰是红色的，紫罗兰是蓝色的” 这种形式在英语中经常被用来开玩笑， 通过为那首特定诗的最后两行写一些有趣的东西来开玩笑。