Because I don't know what's real.

因为我不知道什么是真实的。

To be or not to be Shakespeare onto something.

生存还是毁灭，莎士比亚一直在想这个问题。（注：这句话是《哈姆雷特》中的经典台词，小谢尔顿在剧中有时会引用它。）

What's wrong？

怎么啦？

He's been cutting classes.

他逃课喽。

Look at him. Breaks my heart.

你看他，我心都要碎了。

Poor little guy, all alone.

可怜的小家伙，形单影只。

I don't see why his brother can't sit with him.

他哥哥为什么不能跟他坐在一起。

Come on, Mary.

拜托，玛丽。

When you were in high school.

你高中时。

Your galpals, Penny and Bernadette, went out shopping for some wedding nonsense without Amy.

因为你们的马子，佩妮和伯纳黛特偷偷跑去买婚礼垃圾，也不叫上艾米。她们完全没有想过她们会影响到我，影响弦理论的未来，还影响我的乐高欢乐时光。

I am a man of science, not someone's snuggle bunny.

我是个搞科研的人，不是某人的抱抱兔。

There's a bird outside the window, and he won't go away. That is the hell that is going on.

窗户外面有只鸟，死活不肯走。弄得我跟人间炼狱似的。

Nobody else is stronger than I am.

世上没人比我强壮。

Yesterday I moved a mountain.

昨天我移了一座山。

I bet I could be your hero.

我相信我能当你的英雄。

I am a mighty little man.

我是个了不起的小家伙。

I am a might little man.

我是个了不起的小家伙。（注：这句话与上一句重复。）

I am a might little man.

我是个了不起的小家伙。（注：这句话与上一句重复。）

That was the best trip I ever had, I wish I'd told my father while he was alive.

那是我一生中最棒的旅行，我希望我能在他活着时告诉他。

这些短语展示了小谢尔顿独特的个性和幽默感，希望这些翻译对你有所帮助。