He is on the fence 他是墙头草
on the fence。Fence就是篱笆。On the fence的意思也就是骑在篱笆上，左右不定
例句:
Politicians are past masters at sitting on the fence, hedging their bets, and never giving a straight answer.
一般的政治家都是事后清，他们往往是墙头草，见风驶舵，谈问题向来不直接了当。
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