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1.American research scientists are now working on creating replacements for living tissue.
work on 影响，对…起作用；继续工作；从事于…；设法说服
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。
In order to make him accept our suggestion, I decided to work on him immediately.
为了让他接受我们的建议，我决定立刻对他做工作。
