'Please' is generally used in a polite request when asking someone to do something. 'Please'通常是在礼貌地请求某人做某事时使用的。
Here are some examples: 这里有一些例子： 

"Please pass me the salt."

 请把盐递给我。

"Please order me the steak and potatoes."

 请给我点牛排和土豆。

"Please stop bothering me."

 请不要打扰我。

"Please wash your hands before dinner."

 饭前请洗手。

"Please wait outside until we are ready."

 请在外面等我们准备好。

"Please zip up your coat before you go outside."

 出门之前请把外套拉链拉上。

"Please stand back."

 请靠后站。

The word 'please' can also mean to give enjoyment or satisfaction to. 'please'这个词也可以意味给予快乐或满足。

Here are some examples: 这里有一些例子： 

"The smell of the flowers was very pleasing." 

 花的香味很讨人喜欢。

"May it please the court to admit this into evidence?"

 请法庭承认这是证据吗？

"I was very pleased with how the children behaved in class."

 我对孩子们在课堂上的表现很满意。

"You cannot please everyone all the time."

 你不能取悦所有人。

"She was pleased with the dress." 

 她对这件衣服很满意。