书籍 Summit 1B - 第 9 单元 - 第 3 课

describing something that is possible and therefore can be believed

可信的, 合乎逻辑的

(of a subject of discussion) unclear or uncertain, therefore can be further discussed or disagreed with

有争议的, 可辩论的

(of a thing) very hard or impossible to demonstrate its truth or validity

无法证明的, 不可证明的

doubtful or uncertain in terms of quality, reliability, or legitimacy

可疑的, 值得怀疑的