However, many people were trapped under columns in collapsed buildings during the September 21 earthquake, making it very difficult you notice obvious cracks in the column next to which you are crouched, move away from it.
然而九二一大震中，許多人在大樓倒塌時被大樑壓個正著，搜救起來極端棘手。因此若發現樑柱已出現明顯龜裂，還是避開為宜。