hello是问候用语，意思是哈喽、嗨、你好。
high意思是高的、高处。
例句：
Hello, Mr Brown.
你好，布朗先生
Its about this high.
大约有这么高。
相关介绍
In our company, quality is high on the agenda.
我们公司高度重视质量。
The job brings with it status and a high income.
担任这一职务既有显贵的地位又有丰厚的收入。
This issue has had a high profile in recent months.
近几个月来，这个议题一直是关注的焦点。
She's quite high up in the management hierarchy.
她位居管理层要职。
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。
