第一个句子:I am still a bachelor.我还是一个单身汉. bachelor:

1.单身汉:

I am a bachelor=I am a single man（boy）;

如果是woman: a single woman= a bachelor woman;

单身公寓bachelor, 或者studio;

a bedroom, a kitchen, a toilet, without a living room

2.本科:

专科 Diploma ——出国留学填表格时用得到（节目中没有提到）;

硕士: Master

MBA=Master of Business Administration 工商管理硕士

MPA=Master of Public Administration 公共管理硕士

博士: Doctor

第二个句子:Sorry to have let you down.对不起,让你失望了!

to make sb. disappointed

our parents work hard to support us so as to make us a knowledgeable person! We should not let them down!

父母为了让我们成为有用之才努力工作支持我们,我们不要让他们失望!