请你把中文翻译成为英文
”据他介绍，这主要应归咎于哥伦比亚和尼日利亚叛乱的激化、加拿大森林大火以及卡塔尔罢工等突发事件。
He said unforeseeable circumstances were to blame: rebel activity in Colombia and Nigeria, forest fires in Canada and the strike in Qatar were all to blame.