a shrewd businessman精明的商人

secretive adj.隐藏的，讳莫如深的

Billionaires are usually fairly secretive about the exact amount that theyre worth.

亿万富翁们通常对他们的身价讳莫如深。

smart adj.聪明的，快速的，敏捷的，灵动的

We set off at a smart pace.

我们快步出发了。

dark adj.黑色的，神秘的

dark secrets深藏不露的秘密

dark corners of the solar system太阳系不为人知的角落

拓展

今日一句的另一英译版：

I am much too small in this world， yet not small enough

to be to you just object and thing，

dark and smart.

—I Am Much Too Alone in This World， Yet Not Alone， Poet， Rainer Maria Rilke