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

我们不应该越界做坏事。

youdao

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？

youdao

When does spanking cross the line and become physical abuse?

从什么时候揍孩子开始变得有争议，就成了生理虐待呢？

youdao

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