请用英文将911叙述一遍

On September 11, 2001, waves of shock rippled through the countryas the United States came under terrorist attack. Never Forgetcollects the unbelievably moving stories of survivors, rescueworkers, volunteers, family members, and friends whose loved onesperished on that dayfrom the moments the planes first struck theTwin Towers through the painstaking recovery efforts..
As these unforgettable stories reveal, many Americans transcendedtheir own confusion and despair to help one another escape, tooffer one another kindness, and to affirm life in the face ofcatastrophe. This concert of voices shows, as never before,theheart breaking grief and slow, but uplifting, healing process thatthe people of this nation have experienced individually and asone

It's too difficult for me to tell.

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