The courts ordered busing to desegregate the schools.法律规定要用校车运送学生来打破学校的种族隔离。We have succeeded in persuading many districts to desegregate voluntarily.我们已圆满地劝服了许多地方自愿取消种族隔离....
Soul food is a varied cuisine: it includes spicy gumbos, black-eyed peas, and collard greens.黑人的食物可谓五花八门：有辣味的秋葵汤，有豇豆，还有羽衣甘蓝叶。In the greengrocers' there are varieties of greens.菜市场里有各种各样的蔬菜。The greens are full of fib...
Methane and propane are alkanes.甲烷和丙烷是烷烃。The general uses of alkanes may be divided into three categories.烷的一般用途可分为三个方面.The straight - chain alkanes exacerbate the problem of engine " knock ".直链烷烃使机器的 “ 爆震 ” 问题更加严重....