首先，妳是否忘記打開聊天功能(位於右上角 chat:on/off 的鈕扣)?? 若不，那就該從另一回應者 -- kraut9 -- 著手看看哪兒出了問題。 祝　週末愉快。/ Good weekend.

There are plenty of potential reasons.... No electricity No PC No internet connection No mic No chat client Your crap country blocks certain chat ports Mic not setup correctly Mic defect Mute

Haha it's normal, anyway Italki is not that professional. Since you just put these two terms together in one question, I become more eager to know: Why do 200% of the Chinese students prefer to say 'who can..., why I can't...', not 'can anyone..., why can't I...'? Looks like it's not Chinglish, why? I've been wondering for long but still no frigging idea. Huh! Beautiful question.