任何时候我们都要尽量避免犯原则性错误。
We should try to avoid making mistakes in principle at any time.
1952年犯过一次，1949年犯过一次，以后我没犯原则性错误。
In 1952 made the first, in 1949 made the first, since I didn't make a mistake of principle.
另外，着重指出目前通行的对自旋—轨道耦合能的传统推导在概念和逻辑上存在的原则性错误。
Furthermore, he emphatically points out that the prevalent conventional deduction from spin-orbit coupling energy is incorrect in principle both conceptionally and logically.
从当前环保部门批复环评文件的现状来看，形式各样，结论不一，甚至出现原则性错误的情况，存在不少问题。
Ratifying the environmental impact assessment document accurately promotes harmonious development between economy and environment, but there are lots of problems in present status of ratify document.
“你离开我们的营地，是犯了一个原则性的错误。”这位朋友说。
"You made a big mistake when you left our camp," said this friend.
“你离开我们的营地，是犯了一个原则性的错误。”这位朋友说。
"You made a big mistake when you left our camp," said this friend.
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