雪靴野兔冬天最大的担忧是捕食者。
Steel's fragility at low temperatures first became a major concern during the Second World War.第二次世界大战期间,钢在低温下的易碎性首次成为人们关注的主要问题。
Recently I've looked at young people's drinking and it's obviously a major concern to Government at the moment.最近我研究了年轻人的饮酒问题,很明显这是政府目前一个主要关注问题。