但到目前为止，尚未发现最无效的治疗办法。

But so far, has not yet found the most effective treatment methods.

youdao

又试了几次之后，我承认这个办法对我无效。

After a few more tries, I admitted that this might not work for me.

youdao

又试了几次之后，我承认这个办法对我无效。

After a few more tries, I admitted that this might not work for me.

youdao