Kazakhstan said yesterday it had over takenCanada and Australia to become the world's biggest uranium miner as nations rich in the resource ramp up(加强,加大)productionto sell into a resurgent(复兴的,复活的) Kazakhstan said yesterday it had over taken Canada and Australia to become the world's biggest uranium miner as nations rich in the resource ramp up (strengthen, increase) productionto sell into a resurgent (revival, resurrection)