Reality tells me that the impossible, it should be forgotten.

现实告诉我，那个不可能的人，该忘了。

youdao

It should not be forgotten that people used to get much more exercise.

不应忘记的是，人们过去的锻炼要多得多。

《牛津词典》

Though this is very convenient for both buyer and seller, it should not be forgotten that cheques are not real money: they are quite valueless in themselves.

尽管这对买卖双方都很方便，但不应忘记，支票不是真正的钱：它们本身毫无价值。

youdao

There were 4, 229 people on board the vessel at the time of the casualty and while the tragic loss of life caused by this regrettable incident will rightly be the subject of forensic investigations for some time to come, it should not be forgotten that without the skilled response of the majority of the crew, the loss of life could have been far higher.

FORBES: Italian Cruise Ship Crew Honored For Bravery At Sea

And then it should not be forgotten - Greece had the ability to spark a severe crisis.

BBC: Greece election: Temporary relief for eurozone

But it should not be forgotten that Americans also have a genius for mixing realpolitik with their religion.

ECONOMIST: Foreign policy