算了:

1. let it be
2. let it pass

例句与用法:
1. 算了，别放在心上。
Forget it.

2. 我以为能负担得起那费用, 后来认真估算了一下才知道过於昂贵.
I thought I could afford it, then I costed it out properly and found it was too expensive.

3. 我们计算了成本, 清楚表明这项工程不合算.
When we had done the costings on the project, it was clear it would not be economical to go ahead with it.
别忘了分分~