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Before clock were invented, people judged the time by looking at the Sun. They got up at the sunrise, and went to bed when it was dark. They ate lunch when the Sun was up above, and ate dinner when it set in the west.
1.manage:明智地使用（金钱、时间、信息等）
2.invente:发明
3.above:在…之上; 在…正上方
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