“打招呼”怎么读

他跟顾客打招呼时直呼其名，并问他们身体可好。He greets customers by name and enquires about their health.他向他们挥一下手，热情地笑着向他们打招呼。He greeted them with a wave and a broad smile.他们俩都笑着跟朋友们点头打招呼。Both of them smiled and nodded at friends....

“打招呼”的英语可以翻译为： greet sb.，say hello，give a previous notice，warn，notify ...