walk/tread a tightrope idiom
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。