to goof off 和to hit the sack。
L: Michael, 别往我头上扔雪块，行吗？你怎么象个小孩呀！
M: Li Hua, I'm just goofing off.
L: 你就是讨厌。我不懂什么是goofing off.
M: Actually Li Hua, to goof off does mean that I'm acting stupid and not being serious.
Goof is a verb.
L: 噢，to goof off 就是干无聊的事，那你确实很无聊，老向我扔雪 块。
M: To goof off is a great term. Young people use it a lot. It is often used to describe
how young people are behaving.
L: 年轻人经常用to goof off 来形容别人的行为？我记得念中学时班 上有个学生
老是打断老师的话，喜欢开玩笑，你可以说这个学生 是goofing off 吗？
M: Yeah, that's right. Children or young people often goof off. Do you remember when
we were at the movies and those high school students threw candy at the screen, you
could say they were goofing off.
M: To tell you the truth, when I went to the library in high school with my roommates
we would usually waste time and ended up goofing off.
M: Yeah, that's right.
L: 怪不得你一开始考不上大学呢！ 行，教室到了，下课等我一起去图书馆，可
M: That's right. Even though it's not that late, I'm ready to hit the sack!
L: 你说什么？你要去捅一个口袋？Sack 不是麻袋吗？我以为你很累了，而你现
M: No, no. It's a colloquial saying. I mean I'm going to bed. Sack, here means bed, and
hit means going to.
L: 噢，原来to hit the sack 是指去睡觉，sack 在这里是指床，hit 是去 床上睡觉的
意思。那我要坐下，能不能说 to hit the chair?
M: No, not really. This phrase -- to hit the sack -- has a pretty limited meaning.
L: 哟，to hit the sack 只能指去睡觉，别的地方还不能用！那要是我 午想睡个午
睡，能不能说：I want to hit the sack?
M: No, it's usually used to talk about going to bed at night, after a long day at work or
L: 午睡也不能用，只能指一天工作和学习后晚上去睡觉。那现在我 已经上了一
天的学，再加上晚上上了这堂枯燥无味的课，我可 以说：It's time for me to hit the
M: That's correct, Li Hua. But don't forget that we have a test tomorrow.
M: Ok, now go hit the sack, but after tomorrow's test we will have to study seriously
for next week's test, no more goofing off.
L: 明天考试后你想好好学习，为下星期的考试作准备。没问题，我 帮你准备，
M: Yeah, I'm going to hit the sack. Bye, Li Hua!
Michael 今天教了李华两个常用语，一个是：to goof off，意思是做一些无聊的事，
开玩笑；另一个是：to hit the sack，这是指晚上上床睡觉。这次[流行美语] 今天