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All that is in my mind when I meet a young person.

每逢我遇到年輕人，腦子里就想到，

he is lending the bank money, repayment of which he may demand at any time,

就等于把錢借給了銀行。這筆錢他可以隨時提取，

This is not easy, and may require two porpoises working together.

這并非易事，可能需要兩只海豚合伙干才行。

And anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bed was flat.

凡是稍稍想過大海海底的人大概都會認為海底是平坦的。

many of them serious and senior scientists---- who dream of sending people to it.

其中的不少人是認真和資深的科學家，他們一直夢想著把人送上火星。

and still cannot fathom the exact outline of the vision before them.

站在鏡前，不能辨認出自身的真面目。