1. 太阳;日
    The sun is the ball of fire in the sky that the Earth goes round, and that gives us heat and light.

sun什么意思

    e.g. The sun was now high in the southern sky...
           太阳正高挂在南边的天空上。
    e.g. The sun came out, briefly.
           太阳短暂地露了露脸。

2. 太阳的光和热;日光;阳光
    You refer to the light and heat that reach us from the sun as the sun .

    e.g. Dena took them into the courtyard to sit in the sun...
           德娜带他们到院子里晒太阳。
    e.g. They were trying to soak up some sun.
           他们想晒晒太阳。

3. 晒太阳
    If you are sunning yourself, you are sitting or lying in a place where the sun is shining on you.

    e.g. She was last seen sunning herself in a riverside park.
           最后一次有人看见她时，她正在河边公园晒太阳。

4. 恒星
    A sun is any star which has planets going around it.

5. 天下万物;世上一切;全世界
    Everything under the sun means a very great number of things. Anything under the sun means anything at all.

    e.g. We sat there for hours talking about everything under the sun...
           我们在那儿坐了几个小时，谈天说地。
    e.g. The fashion-conscious will go for anything under the sun!
           流行意识将无所不在。

6. a place in the sun -> see place