法律文件必须避免歧义。

Legal documents must be free of ___ambiguity.

最后，她最终决定的歧义性存在。

Lastly, there is the ___ambiguity of her final decision.

在谈判中，歧义有时可以作为一种策略工具。

In negotiations, ___ambiguity can sometimes be a strategic tool.