Dozens of scientific groups all over the world have been _________ the goal of a practical and economic way to use sunlight to split water molecules.
举一反三
- Existing WTO rules have been less effective in dealing with groups of countries, and the world body has failed to ensure compliance with WTO rules by all members of an economic bloc.
- All humans around the world have learned to use their bodies the same.
- Qigong and Tai Chi are practices which have been popular over the world for centuries.
- Experts say our company is amazing in that sales have been increasing steadily ________ . A: all in all B: over time C: all over D: all the time
- The test results are beyond ________； they have been repeated in labs all over the world.