20181030 trade-off

trade-off

a balance between two opposing things, that you are willing to accept in order to achieve something.

1）这个决定是权衡效率和成本后的结果。

我的翻译：
The decision is a result of trade-off between efficient and cost.

参考翻译：

The decision is a trade-off between efficiency and cost.

我的错误：
efficient是形容词，此句中应该用其名词形式efficiency；
trade-off已经有结果的意思，用result纯属按照汉语简单对应，画蛇添足了。

2）在英语学习中，需要保持输入端听、读，和输出端说、写的平衡。

造句：
The efficient way of learning English is a trade-off between import and export。