serious什么意思?

serious什么意思 be serious about什么意思? "why so serious"什么意思? It's nothing serious.什么意思 treat in a serious manner 什么意思 you are so serious什么意思 This is very serious problem什么意思 My serious love songs什么意思 You than I am serious什么意思 Please be serious about what you do.这句话中的serious什么意思? Serious lack of oxygen in the cabbages什么意思 cold is not a serious illness什么意思