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4. ever-expanding urban population

e.g. Another possibility would be to use this money to build more regular commuter trains and buses to serve the ever-expanding urban population.

5. embrace the idea of

e.g. We need to embrace the idea of the high-speed rail so that future generations can continue to live safely and efficiently.

6. on a regular basis

e.g. Safety is chief among concerns for those who travel to work or school on a regular basis.