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大部分英文单数名词(大概九成五以上)有冠词(a/an/the),要不然会用复数。很多华人学生写英文都直接加名词,不理有没有冠词,也不管单数还是复数。没有加冠词,英文会听起来像小学生写出来的英文,所以一定要注意。

如果是a/an, 意思是「有很多个,其中一个」。

如果用the,意思是「只有一个」,或是指一个「之前已经提到的东西」。

The 可以想成是等同于this/that,指某一个特定的东西。

For example:You should eat the apple. = You should eat that apple.

You should eat an apple. = There are many apples. You should eat one of them.

The data augmentation technique is used to solve this problem = There is one data augmentation technique, or I mentioned a data augmentation technique before. This data augmentation technique is used.总共只有一个data augmentation technique,或是之前已经提到一个data augmentation technique。A data augmentation technique is used to solve this problem. = There are many data augmentation techniques. I use one of them to solve this problem.总共有很多个data augmentation techniques,这里我指其中一个。I used the algorithm to control the battery.如果是复数名词,前面加the,意思是特定的或已经提到过的一群,可以想成是等同于these/those。如果复数名词前面没有the,意思就是单单是复数。另外,有加the,意思是这一群中的每一个都怎么样怎么样。如果没有加the,意思是这一群中,有的是这样,有的不是这样。

For example:

The students really hate math. = (All of) those students really hate math.那一群学生非常讨厌数学,而且那一群中的每一位都非常讨厌数学。Students really hate math. = Students really hate math (but not all of them hate math).没有特别指哪一群学生,就是普遍指学生讨厌数学,而且有的学生讨厌数学,有的并没有讨厌数学。

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