思路清晰的英文：
did their sums

参考例句：

This demand for clarity of thought and exactness of definition left his victims confused and reeling.
他这种对思路清晰性和定义严密性的追求使被问者狼狈不堪，头晕目眩。

All the examiners commented that Jack had an impressively clear head and considerable powers of independent criticism.
所有考官们评论说杰克思路清晰，给人印象深刻，独立判断能力也相当强。

did是什么意思：
v. [do] 的过去式形式；做

What we did we did for the best.
我们所做的一切都是出于好意。

We did an hour of gym.
我们做了一小时的体操。

Did they get spliced?
他们结婚了吗？

their是什么意思：
pron. 他们的；她们的；它们的；他的；她的
sums是什么意思：
n. 总数，总和；算数；金额；要点
v. 合计；总结

There are spots in (or on) the sum
人孰无过

This is the sum of this book.
这就是这本书的要点。

A Lump Sum Rate of ...
费用合计…