show up 显而易见; 使显示出；到场, 出席；羞辱, 使丢脸
例如：
1.A police put some chemicals on the piece of paper and a line of words showed up.
一位警察在一张条上涂上化学药品, 一行字迹清晰地显现出来。
2.He showed up when we least expected him.
我们根本没有料到, 他竟然来了。
3.He showed his parents up rather badly.
他给他父母丢尽了脸。
show around 领…参观
例如：
Before you start to work, I'll show you around the factory.
开始工作前, 我要先领你参观工厂。
两者的区别由以上可以看出，希望对你有所帮助
