As is often the case, though, the mood swing has gone too far. 不過，與過去常有的情況一樣，人們的情緒波動(dòng)有些過頭了。

Maybe, his apathy signals he is at the negative extremity of a mood swing. 或許萬念俱灰只是他情緒波動(dòng)的一個(gè)極端吧。

2. has something to do with 和……有關(guān)

Someone I care about is in trouble, And this club has something to do with it. Now knowing my father was a member, It only stands to reason that his closest friends were, too. 有個(gè)我關(guān)心的人遇到麻煩，和這俱樂部有關(guān)。我父親曾經(jīng)是會(huì)員，顯然他最好的朋友也是會(huì)員。

We really don't know, but it has something to do with "being." 我們并不知道，但它是與某種存在有關(guān)系的。