A variable displacement pump could save energy during the long holding time.
变量泵可在长的保压时间内节省能源。
The farmer had the tractor working all day long in the fields during the harvest-time .
在收割季节，农夫让拖拉机整天在田里工作不歇。
During the early years of her recovery, she was depressed for a long time.
在她早年的康复过程中，她有很长一段时间一直很沮丧。
During the early years of her recovery, she was depressed for a long time.
在她早年的康复过程中，她有很长一段时间一直很沮丧。
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