劍橋詞典in the US, an expensive phone number that begins with 900, provided by companies offering services such as chatlines (美國(guó)的)900號(hào)碼(由提供電話聊天之類服務(wù)的公司開通的以900開頭的高收費(fèi)電話號(hào)碼) 返回 900 number