Suppose you are a clerk in a convention center,how can you introduce your center to a visitor.假设你是一个在一个会展中心工作的职员,你如何向一个游客介绍会展中心,.eg.—What can i do for you,Mr/Mrs?—Yes...还有么？—Look that.that one is the highest carton.It's made in china.it's also top5 in china .— now,you can to watch anywhere you want.but remember back here at 20 minute later.—Are we clear?—......