He's a shrewd businessman and hard as nails...是什么意思？

He's a shrewd businessman and hard as nails...

他是一个既精明又铁石心肠的生意人。

shrewd

adj. 精明的，敏锐的，奸诈的，狡猾的，有眼光的，精于盘算的；

例句
The President has played a shrewd diplomatic game because from the outset he called for direct talks with the United States...
总统玩了一场高明的外交游戏，因为从一开始他就要求和美国直接对话。

businessman

n. 商人，实业家；

例句
...a businessman who began by selling golf shirts from the boot of his car...
靠他的汽车后备箱练摊兜售高尔夫球衫起家的商人

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

hard

adj. 困难的，硬的，有力的，努力的；adv. 努力地，猛力地，严重地，沉重地；n. 英〉硬海滩，登陆处；

例句
The team fought hard and gave a good account of themselves.
这支队伍奋力拼搏，表现出色。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

nails

n. 钉子( nail的名词复数 )，钉状物，指甲，趾甲；v. 钉住( nail的第三人称单数 )，抓住，证明…不属实，揭露；

例句
Jane was suddenly aware that she was digging her nails into her thigh.
简突然间意识到她正在用指甲抠大腿。