在某种场合下，患者出现一种明知与当时情况相违背的念头，却不能控制这种意向的出现，十分苦恼。

In some occasions, the patient and the circumstances of the emergence of a knowledge contrary to the idea, but can not control the emergence of such an intention, very distressed.

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相反，我们面对的往往是不同表达方式的选择，而这些表达方式在某种情况下都不失为不错的格式，只是就我们最关心的特殊场合而言，存在何种表达方式相对更好的问题。

We are usually faced with a choice between expressions, any of which would be admirable in certain circumstances, but one of which is best for the particular occasion with which we are concerned.

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