host unreachable什么意思

It's unreachable什么意思 book a host family什么意思? a whole host of什么意思 是个词组吗 host family的意思 host造句,主人的意思 host reach out to the host another way和come to什么意思啊? a host of 是啥意思? His host mother的中文意思? 帮我翻译下什么意思This is the mail system at host mx-6-66.vip.sina.co service agent或HOST 是不是什么工作? host,take place,hold 有什么区别?