以下为句子列表：
英文: A smooth, lustrous, variously colored deposit, chiefly calcium carbonate, formed around a grain of sand or other foreign matter in the shells of certain mollusks and valued as a gem.
中文: 珍珠在几种软体动物的贝壳中，围绕着一粒沙子或其他外来物质形成的一种光滑、有色泽、具有不同颜色且主要是碳酸钙的沉积物，被珍视为宝石
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英文: Avoid damaging effects of foreign matter in the flow by using a strainer ahead of the valve.
中文: 为了避免外来物质的破坏作用，要在阀门前面采用一个过滤器。
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英文: Blow out lines to remove all loose scale and other foreign matter that can damage valve seat.
中文: 吹出管道内可能损害阀门阀座的所有疏松的氧化皮和其他外来物质。
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英文: First, place the victim on his back and remove any foreign matter from his mouth with your fingers.
中文: 首先，将遇难人背靠地放平，（如果有异物）用手将其口中异物取出。
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英文: Flush the lines to remove all loose scale, dirt and other foreign matter that can damage or clog the valve.
中文: 冲洗管线，清除可能损坏或堵塞阀门的所有疏松的氧化皮、污垢和其它外来物质。
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