The spines of sea urchins can generate a voltage when water moves around them — a phenomenon that could be used to design underwater flow sensors.
This changed everything. The team returned to the sofa customer list and narrowed that down to just those clients who lived within a 100-mile radius of Harp's brick factory in the US' south-west.
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自中国去年4月实施相关出口限制以来，尽管北京已允许大量稀土出口恢复，但海关数据显示，这类材料运往美国的货流仍十分稀少，未因去年10月中美关系缓和而明显回升。
「中國渴望成為引領世界的領導者，並憑藉多年的戰略耐心為此奠定了基礎。在可預見的未來，北京在軍事實力上可能與美國平起平坐。中國有系統地利用他人的依賴關係，並根據自己的利益重新定義國際秩序。」默茨的發言被解讀為將中國定位為與美國同樣能影響全球秩序的新強權。