You are welcome 当“没关系、不客气”讲时,用于对别人感谢的回答.
=It's my pleasure.
或者=my pleasure.
用作欢迎语(有时可省去 You are 而只说 Welcome),意为：欢迎欢迎.
=We welcome you!
=Welcome!
表示允许对方做某事或使用某物(其后常接介词 to—这里的 to 既可用作介词,其后接名词或代词；也可用作不定式符号,其后接动词原形),意为：请自便；随便你；你尽管可以…如：
You are welcome to any opinion you like.你可以畅所欲言.
You’re welcome to (use) any instrument here.这儿的仪器你尽管可以使用.
=Please feel free to...
=Please help yourself to.
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