"bright line" in Chinese (Simplified)
明确界限明线
Definition
一条清晰明确的规则或界限，用来区分两种事物，常用于法律、政策或讨论中，表示什么是允许的，什么是不允许的。
Usage Notes (Chinese (Simplified))
“Bright line”在法律、政策或学术场合较为正式，表示清晰无疑的规则。常用作比喻，表达明确区分，不用于实物的真实线条。
Examples
There is a bright line between what is legal and what is illegal.
合法与非法之间有一条**明确界限**。
The teacher drew a bright line to show the difference between fact and opinion.
老师画了一条**明确界限**，以说明事实与观点的区别。
The law gives a bright line for age limits in voting.
法律对投票年龄有**明确界限**。
There's no bright line telling us exactly when a hobby becomes a job.
没有**明确界限**告诉我们兴趣何时变成工作。
We need a bright line rule so there's no confusion about the dress code.
我们需要一个**明确界限**的规则，这样关于着装规定就不会有混淆。
For some ethical issues, there just isn't a bright line—it's a gray area.
对于某些道德问题，根本没有**明确界限**，只有灰色地带。