Hello, it's us back again.
嘿！我们又回来了。
Hello? You didn't really mean that, did you?
嘿？你不会真是那个意思吧？
He popped his head around the door and said hello.
他从门后探一探头，打了声招呼。
Don't be shy ─ come and say hello.
别害羞——过来问个好。
We were passing through, so we thought we'd come and say hello.
我们路过此地，所以想来问候一声。