Ku brings up a fence in a zoo as an example. If the welds in the fence were carelessly made, children crowding up against the fence might cause those joins to come apart, resulting in a terrible accident.
他特別舉動物園的欄杆為例，欄杆的連結處，若焊接的隨便，當參觀的小朋友推擠時，便容易解體而發生不幸事故。