He injured his ribs in a tumble from his horse.
他从马上摔下来伤了肋骨。
Deutsche Bank predicts coal's share of electric power generation will tumble from 47 percent in 2009 to 34 percent in 2020 and 22 percent in 2030.
根据德意志银行的预计,全国燃煤发电所占比重将会从2009年47%下降到2020年34%,到2030年,这个比例还将下降到22%。
If the sun should tumble from the sky.
如果太阳从天上坠落。
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