黄道的倾角是季节的基本成因.The obliquity of the ecliptic is the fundamental cause of the seasons.黄道面与赤道面的夹角是黄道的倾角.The obliquity of ecliptic is the fundamental cause of the seasons....
A Delta II rocket was launched from Cape Canaveral early this morning.今天一早，一枚“德尔塔”Ⅱ型火箭在卡纳维拉尔角发射升空。They're freshly baked. I fetched them from the baker's this morning.它们是刚出炉的。我早上去面包房买回来的。The weather was unkind t...