tightrope
noun [ C ] uk/ˈtaɪt.rəʊp/ us/ˈtaɪt.roʊp/
（尤指用于娱乐表演的）绷紧的钢丝（或绳索）
a tightly stretched wire or rope fixed high above the ground, across which skilled people walk, especially in order to entertain others
One of the acrobats who walked the tightrope at the circus did it blindfolded. 马戏团里走钢丝的杂技演员中有一位是蒙着眼睛走的。
Idiom
walk/tread a tightropeidiom 走钢丝;（尤指因进退两难而）处境危险
If you walk/tread a tightrope, you have to deal with a difficult situation, especially one involving making a decision between two opposing plans of action.
Many manufacturers have to walk a tightrope between pricing their goods too high and not selling them, and pricing them low and losing money. 许多制造商都面临两难的境地：或把价格定得太高结果卖不出去，或把价格定得很低结果赔钱。