第一句：That's for my personal use.
那是我自己喝的。

A:I bought a bottle of XO at the duty-free shop, but that's for my personal use.
我在免税店买了一瓶XO，但那是自己喝的。
B:I see. Could you put the suitcase on the counter?
噢。你能把包放在柜台上吗？

第二句：Here is the prescription from my doctor.
这是医生开的处方。

A:What's this? It does not look like tonic.
这是什么？它看起来不像是保健品。
B:No. It's medicine for my stomach. Here is the prescription from doctor.
不。它是我的胃药。这是医生开的处方。

在表达自己的主观猜测时，可以说：I suppose that...；I guess that...；I assume that...；XO是白兰地的专用术语，表示“贮藏期”的意思。