在解释英语时,看一下英语的释义
welcome
1.to greet someone in a polite and friendly way when they have come to see you or to help you（即当别人来看或来帮助你时,用welcome是有礼貌和友好的greet）
如：Visitors will be warmly welcomed.
2.to say that you are pleased to accept or consider something such as an opportunity or a question （当你开心的接受别人一个机会啥的）
比如：We welcome suggestions from our readers.
greet
to behave in a polite or friendly way towards someone when you meet them当你见到别人时,打招呼
如：The women greet each other with kisses on both cheeks.
此外,welcome可以做名词和形容词讲,而greet是个动词
如：
The mayor said some words of welcome
Your friends are always welcome here.
体会一下哦