它因塞文潮而闻名，塞文潮是一种定期从海里沿河向上流动的巨浪。
It's well known for the Severn Bore—a tall wave of water that regularly—flows up the river from the sea.
可以定期从雇主那里领到薪水
他定期从三种深度收集土壤样本，分析其中的有机碳。
He periodically collects soil samples at three depths and analyzes them for organic carbon.
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