1、 He was too yellow to stand up for his rights、他太怯懦，不敢维护自己的权利。
2、 Yellow is my favorite color、黄色是我最喜欢的颜色。
3、 He is too yellow to stand up and fight、他太胆怯而不敢起来抵抗。
4、
5、 The bullies picked on him because he was yellow、因为他怯懦，所以混混找他麻烦。
6、 It was autumn and the leaves were beginning to yellow、已经是秋天了，树叶开始变黄。