duration

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【词性】：n．

【释义】：

持续时间；持久

duration of confinement产褥期

duration of labor产程(分娩时限)

duration of life寿命；寿限

duration of pregnancy孕期

patients of long duration of the disease久病患者

The main symptoms include their location，nature and duration．主要症状包括其部位、性质及持续时间。