1)Law school's a completely different world.
a different world 大不一样
例句：Living in Australia feels like a different world from living in China.住在澳大利亚的感觉跟住在中国完全不一样。
2)I need to stop dicking around.
dicking around 瞎玩，瞎闹，混日子，不严肃，不正经messing around
例句：Quit dicking around!We have a lot of work to do.You need to stay focused.
3)I think we should break up.
例句：I can't believe she broke up with me.We've only been going out for 2 months. I thought she really liked me.