People believe: spring can be traced by following it.
人们会相信：跟着它走准能把春天追着。
All contacts are being traced and will be followed up by the health authorities.
卫生部门正对所有接触者进行追踪调查。
By putting thin paper over the map, John traced it.
约翰把薄纸铺在地图上照着描画。
By putting thin paper over the map, John traced it.
约翰把薄纸铺在地图上照着描画。
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