为什么different signs______ 开头用mean 不用means

为什么different signs______ 开头用mean 不用means Does it mean we should be quiet?用mean还是用means为什么 try every possible means 为什么是means 不是mean.不是说有every each修饰时用 mean different what does it mean?为什么用does而不用is Law and order(means,mean)different things to people with dif 为什么是means of transportation不是mean of transportation Reduce means ”use less“ 的mean 为什么要加S? What can he mean?中的mean为什么不用三单加S? 关于mean和means. mean,means,meaning有啥区别?怎么用的? What does b_ mean?It means "bike".开头为b的单词怎么填