mean / mean by 點用??

What does XXX mean ?-
What does it mean by XXX ?
如XXX是人的話, 則兩句的意思是一樣的.
但如XXX是物件(noun)的話, 則有不同.
例:
What does silence mean? 緘密這字點解?
What does it mean by silence? 為何要緘密? 或 (有什么理由需要緘密?)

What does this word mean ? (The meaning of an object.)
What does the teacher mean ? (The meaning of one's thought.)


He throws rubbish towards us. What does it mean by ?
(The meaning of a behaviour or a habit.)

what does XXX mean? 問XXX 點解﹖
- what does 2 o'clock mean? does it mean that i have to come home by then?
兩點點解亞﹖ 系咪要番到屋企﹖

what does it mean by XXX﹖ 問點解XXX﹖
- what does it mean by 2 o'clock? does it mean that i have to come home by then?
點解兩點亞﹖ 系咪要番到屋企﹖

意思差不多﹐ 不過語氣唔同。

yes, These are same. The meaning is equal to This is my friend or This is friend of mine.

I THINK THIS IS SAME !!