To which there could many answers at the Battle of Mantinea, but it seems there's a much easier answer.

曼提尼亚战役可能会给我们很多答案,但以下的回答可能是最直接的

耶鲁公开课 - 古希腊历史简介课程节选

Instead of being very direct, you can use "I don't know" to soften your response slightly.

但你不想说得那么直接，你可以用“I don't know”来让你的回答更为委婉。

I don't know 课堂 - SpeakingMax英语口语达人

and poses an answer which is by no means straightforward and simple.

而给出的回答也绝不是简单直接的。

耶鲁公开课 - 文学理论导论课程节选

I'm looking for something more direct here.

我想要一个更直接的回答

耶鲁公开课 - 博弈论课程节选