There are several main reasons why old buildings should be torn down and replaced by new ones.

旧建筑物应该被拆除并被新建筑物取代，这有几个主要原因。

youdao

The old Silk street was torn down.

老的秀水街早已被拆了。

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The notice was torn down.

通知被人撕下来。

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The stiff,crackling noises of frozen animal skins told him that the chiefs tent was being torn down.

VOA: special.2010.02.27

If you read one of the websites that I like to look at, Psycho Palisades, and palisades describe the strong fence that protect you from being torn down.

如果你到我喜欢去的一个网站去看看，叫做心理护栏，护栏形容的是那些强大的篱笆,保护你不被打倒。

麻省理工公开课 - 媒体、教育、市场课程节选

And in fact in one with the girl describing her side, she several times emphasizes this need for protection, need to be free from being torn down from people around them.

事实上像一个女孩子表达的那样，她好几次强调了需要保护的愿望，需要逃离那些打倒她的东西,逃离身边的人们。

麻省理工公开课 - 媒体、教育、市场课程节选

They want the ring fences protecting departments and various bits of government spending torn down.

BBC: Budget 'sacred cows�� under threat in welfare row

One reason may be that many homes from this era have been torn down.

WSJ: The Return of That '70s House

Macy's may face some financial pressure but "it's not like a building torn down, " he said.

WSJ: Judge: JCP can sell Martha-designed goods for now