求翻译：然而他没有想到的是，就在他13岁的时候，母亲离开了，离开了这个灰蒙蒙的家庭，家庭的重担顿时落在了这个才刚刚成熟的男孩。他没有害怕，没有逃避，他跟每个人一样都有着自己微茫的希望和追求，他选择了作为一个“只要脊梁不弯，就没有扛不起的大山”的男人，肩负起这个无比沉重的责任。是什么意思？

However he did not think that, just when he was 13 years old, the mother left, leaving the grey family, family burden suddenly falls in this only just mature boys. He has no fear, no escape, he and like everyone has their own hopes and pursuit of the blurred, he was selected as a "as long as the backbone does not bend, there is no carry no mountain" men, shouldering the heavy responsibility.