第七大陆：南极洲

　　At -100 degrees F, you can burn up to 5,000 calories a day, and with winter at less than 1% humidity, your body will lose water just breathing. This is Antarctica, where close-knit communities of scientists, engineers, and hardened field vets have forged an existence unlike anything on our planet, fighting brutal conditions to conduct crucial science午后，李阿姨在社区公园悠闲散步时，偶然看见一群孩子在绿茵场上奔跑嬉戏。孩子们的欢声笑语驱散了午后的闷热，她也不由自主地加进追逐之中，并用幽默的语言逗得孩子们咯咯直笑。那温馨的场面仿佛让整个公园都沉醉在一片快乐的氛围中。