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this is没有缩写形式。this is的意思是“这是”。this is的例句：1、This is going to be a huge problem for us.这将是我们的一大难题。2、This is the second time it's happened.这已是第二次了。
this is相关例句
This is the one major drawback of the new system.
这是新系统的一大弊端。
This is one of the most commonly used methods.
这是最常采用的方法之一。
This is just one of a whole complex of issues.
这仅仅是所有相关的问题之一。
This is too big ─ have you got a small one?
这个太大——有没有小的？
This is the main factor driving investment in the area.
这是推动在这个地区投资的主要因素。