sulphur pearl
To send a mail bomb (of either sense).
plural of pout
a very large, but harmless, bacterium, Thiomargarita namibiensis, that grows as a string of white beads large enough to be visible to the naked eye in the coastal sediments of Namibia
plural of umpire
海洋生物学者たちは、ナミビア沿岸の堆積物を調査しているとき、肉眼で見える白い珠の連なりを作る巨大で無害な硫黄細菌（Thiomargarita namibiensis）をやさしく撮影した。
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