" Don't be a spoilsport, Arthur! " boomed Ludo Bagman, rattling his pockets excitedly.

“不要扫兴嘛，亚瑟！”卢多·巴声大气地说，一边兴奋地把口袋里的钱弄得叮当乱响。

When the spoilsport ruins the fun, he always does so by refusing to play by the rules.

有些扫兴的人会使游戏变得索然无味、毫无趣可言，往往是因为不遵循游戏规则。

You wouldn't want to get a reputation for being a spoilsport, would you?

你不想得到一个扫兴的名声，是吗？

Nathan is telling Bethany that if she leaves now, she'll get the reputation for being a spoilsport.

Nathan 告诉 Bethany， 如果她现在离开，她会得到扫兴的名声。

Oh, go home, William, if you're going to be such a spoilsport. -All right, I will.

你非要这么扫兴，还是回家吧，威廉。-好，回就回。

Oh, go home, William. If you're gonna be such a spoilsport...

威廉 你要还这么扫兴 就回家。

Someone who isn't interested in doing fun things, especially someone who wants to do everything properly, that doesn't want to break any of the rules, that's what a spoilsport is.

一个对做有趣的事情不感兴趣的人，尤其是那些想把每件事都做好的人，不想违反任何规则的人，这就是一个破坏运动。

Here what Bethany means is that she would rather have the reputation for being a spoilsport than being the kind of person who keeps drinking as the night goes on – at least, I think that's what she means.

Bethany 在这里的意思是，她宁愿拥有嗜酒成性的名声，也不愿成为那种夜不能寐的人——至少，我认为她是这个意思。