We shouldn't cross the line and do bad things.

我们不应该越界做坏事。

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If so, what can make people cross the line?

如果可以，是什么让人们越过那条界线？

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It also said that the claims of help for the joints and bones cross the line into fraud.

CSPI同时认为关于饮料能有益于骨头和关节的宣传是一种欺诈。

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and Mexican officials. Every day, thousands of people on foot and in vehicles go back and forth across the border here, and millions of dollars worth of products cross the line in trucks and railroad cars.

VOA: standard.2009.04.30

What do we call the point where the pink and the blue line cross?

蓝粉两线的交点叫什么

耶鲁公开课 - 博弈论课程节选

What does it tell us that the pink and the blue line cross?

粉色的线和蓝色的线相交说明什么

耶鲁公开课 - 博弈论课程节选

Go "in the book" and, the next time you cross the line, you're gone.

WSJ: Angel Di Maria's Delay Tactics Leave Real Madrid Seeing Yellow��Gabriele Marcotti

Mr. Hilton's classmates were concerned that the videos might cross the line from familiar to intrusive.

WSJ: Relying on Classmates for Career Advice

The difficulty is determining where unions cross the line, especially when they represent public employees.

FORBES: Magazine Article