If executives fail to exploit the opportunities of networking they risk being left behind.如果高管们未能抓住机会建立关系网，他们就有落后的风险。I had the terrible feeling of being left behind to bring up the baby while he had fun.我感觉糟糕透顶，我被留下抚养孩子，而他却在寻欢作乐。He was fearful of being left behind. = He was fearful that he would be left behind.他怕被落在后面。