同学你好，该知识点来自沪江网校《Hitalk生活口语入门级至初中级【现金奖励班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好哦~
Some of the outgoing infrared radiation is trapped by this layer of atmosphere and held inside the atmosphere and that's a good thing because it keeps the temperature of the earth within certain boundaries and makes the earth livable.
一些发出的红外辐射被这层大气层捕获并保存在大气层中，这是一件好事，因为它将地球的温度保持在一定范围内，使地球适宜居住。

livable adj. 适于居住的；生活过得有价值的；宜居的
祝同学学习愉快~