The sun was already up when they set off.
他们出发时太阳已经升起了。
I could feel the warm sun on my back.
我背上感受到了阳光的温暖。
The earth takes a year to make a circuit of the sun.
地球绕太阳运行一周需要一年的时间。
The trees form a natural protection from the sun's rays.
树木起天然的保护作用，遮挡了阳光的照射。
Our son's having problems with his reading and writing.
我们儿子在读写方面有困难。
Well, son, how can I help you?
那么，孩子，我能为你做点什么？