5.
run out用完, 耗尽
e.g.our food is running out;where can we turn for help?
What will happen if the natural recourses on earth run out?
6.look ahead v.计划未来, 预测未来
7.global warming 全球变暖
8.ozone layer臭氧层(距地球表面20-40英里, 为同温层的外缘)
9.
awareness n. 意识, 注意
global awareness 全球意识
political awareness政治常识
tactical awareness战术意识
10.at least 至少 at most
