It should be: Alas, this is what a man should do!

Original source

"Historical Records of the Great Ancestor" records:

The Great Ancestor Chang Yao visited Xianyang and looked around at the Qin Emperor. He sighed and said, "Hey, This is what a real man should be like!"

The translation into modern text is: Liu Bang once served in Xianyang, and one time Qin Shihuang was on a tour. After Liu Bang saw Qin Shihuang beside him, he looked up to the sky and sighed: "Oh, a real man should be like this. Like this!"

It shows that Liu Bang is a man with lofty ambitions. When Xiang Yu saw Qin Shihuang, he said: He can replace him.

Both of these guys are ambitious people.