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1.work on 从事于
The scientists are still working on inventing new methods of reaching outer space.
科学家们仍致力于发明到达外层空间的新方法。
2.show up 显露
These cancer cells do not show up in the standard tests until they have multiplied to a few billion.
直到这些癌细胞增加亿万倍，它们在标准性检测中并不显示出来。
3.head back 回去
If your parents no longer live in your childhood home, you can still head back there and visit the old neighborhood.
如果你的父母已不住在你童年时的家，你也可以回去那里瞧瞧老邻居。
