So he keeps on studying after his English classes in order to prepare for life in America.
所以他在英语课下课后还继续学习,为以后在美国生活做准备。
When we talk about the universe, we mean the earth, the sun, the moon and the stars, and the space between them.
人们谈论宇宙时,是指地球、太阳、月亮、星星以及它们存在的空间。