walk a fine line - 走
钢索 此线或许是地面上的一条线，线外左右两边则都是禁区，是一种比喻性的说法罢了。
Walk a fine line
If you have to walk a fine line, you have to be very careful not to annoy or anger people or groups that are competing. ('Walk a thin line' is an alternative.)
Walk a tightrope
If you walk a tightrope, you have to be very careful not to annoy or anger people who could become enemies.
参考资料：
Generally, "walk a fine line" means to handle a situation with great delicacy and care, with not a lot of room to maneuver (figuratively speaking). Usually the stakes are considered to be high. Often it's understood as trying to balance two extremes. (Of course, a specific context might be understood as a variation on this...)
For example:
"Rosa walks a fine line in renegotiating higher prices with our best client."
"The police chief is walking a fine line in dealing with the kidnappers."
"Politicians walk a fine line between appealing to the most voters and watering down their messages."
It's based, I'm sure, in a tightrope walker (funámbulo), who walks an extremely fine line and the risks are great if he fails, so...
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