but the line they dare not cross is to splice human genetic material into an experiment.

VOA: standard.2010.06.09

What does it mean to say the pink and the blue line cross?

这两条线相交到底说明了什么

耶鲁公开课 - 博弈论课程节选

Now, just to repeat, again I know I've got some math phobics in the audience, let me just slow down a second, all I'm doing here is I'm saying look at this equation of the pink line, look at this equation of the blue line, X is when they cross, i.e., they are equal to each other.

我再重复一遍,我知道你们之中有些人数学不怎么好,我放慢一点说,我是这么解的,看这条粉线的方程,还有这条蓝线的方程,X是二者的交点,也就是说这点两个方程相等

耶鲁公开课 - 博弈论课程节选

The Greek Cypriots canceled the latest session Thursday after Turkish Cypriot authorities held up a bus convoy of Greek pilgrims for lengthy security checks as they sought to cross the dividing line between the communities.

VOA: standard.2009.09.05