据说是美国这边一个月前改了规则，允许负的，也许可以交涉。

来源: Noahh 于 2020-04-24 11:33:21 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.