when he was at college,he used to travel a lot.这句活used to已经表示过去常常,为什么后面还加a lot

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when he was at college,he used to travel a lot.这句活used to已经表示过去常常,为什么后面还加a lot

use to虽然表示过去常常.但意思上偏向时态多一点.指过去.
a lot 则偏重常常,经常.