Australia 10 1 can I appeal if I refuse the visa?

Basically, the chances of success in the appeal are very small and rarely successful. They are all re-visas.

Your refusal letter should clearly state the specific reasons for your refusal, not your thoughts.

Regarding your second point, the plan to return to China, it is normal to say that it is not clear that it is rejected. The importance of learning a language has nothing to do with whether you return to China or not.

If the visa officer thinks that your reasons for going abroad are insufficient, then it is your information and my telegram that makes him think that you don't need to go abroad at all. If it is rejected for this reason, it is useless to appeal.

Only when you submit your visa again, write another letter explaining why you were refused your visa last time. If the visa officer thinks your explanation is reasonable, then he will give you a visa.