月极附近永久性阴影地区的挥发物的本质是什么？
What is the nature of the lunar volatiles in the permanently Shadowed regions at the lunar poles?
一年中的6个月里，地球的两极几乎没有任何光线。
For six months of the year, there is hardly any light at the poles.
“极寒天气突袭，出于对邮政员工的安全考虑，”美国邮政周三上午宣布，“将于1月1日暂停送货服务。”
"Due to this arctic outbreak and concerns for the safety of USPS employees," USPS announced Wednesday morning, "the Postal Service is suspending delivery Jan 1st."
应用推荐