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.
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