1. This explosive growth has led to removal of forests in much of the country, and excessive use of existing farmland.
    这种人口激增已导致了该国许多地方森林的消失及对现存农田过度耕作。

2. He sees some present models of schooling — community schools and home schooling, for example — becoming more central and other models, not yet existing, may develop.
    他发现一些现存的教育模式——如社区学校和家庭教育——可能会变得更加重要，同时还会形成其他的教育模式，尽管现在还未存在。

3. Professor Meighan of Nottingham University says parents were fed up with the requirements of existing schools.
    诺丁汉大学的梅甘教授说家长对现有学校的各种要求感到厌倦。

4. Given the existing system, which links together all 51 U.S. motor vehicle agencies, "no other state agency tracks the movement of people more accurately."
    "现有的系统将美国所有51个汽车管理部门连接起来，在这一点上，"任何其他的政府机构都不可能比它更准确地跟踪人们的行为。"

5. For months she had been existing without sufficient food.
    几个月来，她就一直没有吃过一顿饱饭。