- 很难说, 没法知道: there is no saying
- 很难说声对不起: hard to say im sorry; hard to say i’m sorry
- 他什么时候回来还很难说: no one can tell when he will return
- 难说: it's hard to say; you never can tell 他什么时候回来还很难说。 no one can tell when he will return
- 难说抱歉: hard to say im sorry
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