It was his father's shell, the OARS going in a fierce, even rhythm, biting the water, going upstream.

那是他父亲的小船，划桨的节奏匀称有力，吃水很深，正在往上游划。

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Since 1970s, the vibroflotation technique was introduced into China for soft foundation strengthening with better results but without application in upstream slope in sanded shell dams.

振冲技术自70年代引入我国以来用于软基加固效果较好，但应用于砂壳坝上游坝坡尚未见工程实例。

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