a balance between two opposite things,that you are willing to accept in order to achieve something
可数名词，“权衡”“折中”，可以在口语和写作中替换"balance"。最常见的表达句式是" a trade between A and B"。
应用：
1）翻译：这个决定是权衡效率和成本后的结果。
This decision is a trade-off between efficiency and cost.
2）造句
Working part-time is a tradeoff between studying and living.
(打零工是解决学习和生活矛盾的折中方法。）
