Union is strength. 团结就是力量。
Unkindness destroys love. 粗暴毁爱情。
Unprofitable eloquence is like the cypress, which is great and tall, but bears no fruit. 无益雄辩不济事，犹如柏树参天不结果。
Until all is over one's ambition never dies. 不到黄河心不死。
Use a book as a bee does flowers. 读书如蜜蜂采花，吸取其中之精华。
Use is a second nature. 习惯成自然。