Vocabulary
| contribute to |
| introduce |
| inspire |
| invent |
| prove |
| set a record |
| impress |
| revolutionize |
| cutting-edge |
| creative |
| imaginative |
| innovative |
| revolution |
| discovery |
| trial and error |
| chemist |
| scientist |
| inventor |
| researcher |
| win the Nobel Prize |
| safe drinking-water |
| poor sanitation |
| play an essential role |
| replace ～ with |
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