1. 微笑;笑
    When you smile, the corners of your mouth curve up and you sometimes show your teeth. People smile when they are pleased or amused, or when they are being friendly.

    e.g. When he saw me, he smiled and waved...
           他看见我的时候，微笑着朝我挥挥手。
    e.g. He rubbed the back of his neck and smiled ruefully at me...
           他挠了挠脖梗儿，对我苦笑了一下。

2. 笑容
    A smile is the expression that you have on your face when you smile.

    e.g. She gave a wry smile...
           她苦笑了一下。
    e.g. 'There are some sandwiches if you're hungry,' she said with a smile...
           她笑道：“你要是饿的话，这有一些三明治。”

3. 微笑着说;微笑着表示
    If you smile something, you say it with a smile or express it by a smile.

    e.g. 'Aren't we daft?' she smiled...
           她微笑着问：“我们不是很傻吗?”
    e.g. She smiled her thanks and arranged the guitar under her arm.
           她微笑着致了谢，把胳膊下面的吉他调整了一下。

4. (命运等)青睐，眷顾，垂青
    If you say that something such as fortune smiles on someone, you mean that they are lucky or successful.

    e.g. When fortune smiled on him, he made the most of it...
           当好运来临时，他充分把握住了。
    e.g. God is not smiling on our cause.
           我们的事业没有得到上帝的垂怜。

5. 满面笑容(常指先前因某事发愁)
    If you say that someone is all smiles, you mean that they look very happy, often when they have previously been worried or upset about something.

6. to wipe the smile off someone's face -> see wipe