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1.You are not going to get a 90 by just showing up or just going to the exam.
show up 露面，揭露
Scientists know that cancer may not show up for many years.
科学家们知道癌症可能会潜伏多年。
We waited until five o'clock, but he did not show up.
我们一直等到了5点，但是他始终没有露面。
n. 有效，有用，有益；可得到的人(或物)
