VOA慢速英语:For or Since: What Is the Difference?

短语讲解：

1. In English, we often use prepositions to place a noun, pronoun or noun phrase in time.

in time 及时; 迟早
例句：I can't ensure that he will be there in time. 
我不能保证他会及时到那里。 

2. Today, you will learn about why you should use for in the first sentence, and since in the second sentence.

learn about 获得，学得
例句：Childrenseem to learn about computers by osmosis. 
儿童似乎不知不觉地就了解了计算机。

3. You heard the singer say "for years." She says "for" because the word "years" refers to a period of time.

refer to 参考; 指的是
例句：Don' t refer to that problem again, please. 
请不要再提那个问题了。

4. Since is used to refer to a specific point in time.

be used to 习惯于，适用于
例句：Technology should be used to give man a happier, fuller, and richer life. 
技术应该用来使人们生活得更幸福，更美满，更丰富。

5. I hope that you remember this lesson for a long time!

for a long time 长久
例句：He has been waiting for his brother for a long time. 
他等候他兄弟已很久了。