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1·He would vote against it on principle.

他会依据原则投票反对它。《柯林斯英汉双解大词典》

2·He doesn't invest in the arms industry on principle.

他根据自己的信条，不投资军火工业。《牛津词典》

3·He acted always on principle.

他总是按原则办事。

4·I refuse to go there, on principle.

我原则上拒绝到那儿去。

5·Stand on principle, man.

坚持原则，伙计。

6·I accept the suggestion on principle.

根据原则，我接受这些建议。

7·He dealt with the problem on principle.

他根据既定原则处理那问题。

8·On principle, I had nothing against the idea.

原则上，我并不反对这个主意。

9·Sometimes Google really does operate on principle.

Google有时确实是在按原则办事。

10·He would never deal with the person on principle.

他按照原则绝不跟那个人做生意。