This is the 8313th most frequent Chinese word.
lau
The word "lau" is not standard Mandarin. In Cantonese, "lau" (留) can mean "to stay" or "to remain."
The word '笑' means 'to laugh' and is used here to indicate the action of laughing happily.
他笑得很开心。
He laughed very happily.
The word '劳' in '劳驾' is used politely to request help, literally meaning 'to trouble someone'.
劳驾，请帮我拿一下那个东西。
Excuse me, please help me to get that item.
The word '劳' is implied here, as '努力' (effort) often denotes labor and dedicated work.