I knew since I was in high school that there's got to be some kind of clock that's ticking inside of us.从高中起我就知道我们体内应该存在着像钟一样的东西

some kind of:某种

You seem to have picked up some kind of infection.

你似乎已受了某种感染。

inside of:在 ... 之内

He is on the inside of that deal.

他知道那笔交易的内幕。

No matter how well we eat,不管我们吃得多健康

no matter:无论； 不管

No matter how hard he may try, he will not succeed.

不管他怎么努力去干都不会成功的。

and that if you look for it, you'll find it.如果你试图寻找，也许会找到它

look for:寻找

You can look for the book in the library catalog.

你可以在图书馆的图书目录上查找这本书。