例句：
He could feel the heat of the sun on his back.
他能感觉到太阳照射在背上的热度。
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。