show up到场, 出席,如约赶到,出现,露面

例句：He showed up when we least expected him.
      我们根本没有料到, 他竟然来了。

      He promised to come on Tuesday but he never showed up.
       他答应星期二来, 可是一直未露面。

2.Tornado Alley sees a lot of twisters pop up in the spring.

pop up突然出现,冒出

3.Officials have closed off more waters to fishing. Nearly a third of the Gulf now is off limits.

close off堵塞(路口等)

例句：Lots of people closed off the street yesterday when I went home.
      昨天我回家的时候, 很多人堵住了路。

      The street was closed off for too many cars.
      道路由于车辆过多而受阻。
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