Something must be done about it. 必须得想个办法。 His new novel is a must for all lovers of crime fiction. 他的新小说是罪案小说爱好者必须一读的。 In England traffic must keep to the left. 在英国, 车辆必须靠左行驶。
faith
n. 信任, 信仰
Christians profess their faith when they say the Creed. 基督教徒在念信经时就表明了他们的宗教信仰. Nothing could extinguish his faith in human nature. 没有什么能使他丧失对人性的信心。 Missionaries went far afield to propagate their faith. 传教士到远方去传播其信仰.