It HAS long been known that the air and water encountered by people in their daily lives are filled with all sorts of micro-organisms.
大家早就知道，日常生活中我们所接触到的空气和水里都包含着各种各样的微生物。
"Water has become so commonplace in our lives (at least in Western First World countries) that, Fagan says," we are indifferent to it and have been for a long time.
水在我们的生活中早已变得相当平淡无奇(至少在西方第一世界国家如此)，费根说，“我们对它视若无睹，而且长期以来就一直如此。”
The pigmentation of apearl is influenced by the type of oyster in which it develops and bythe depth, temperature, and the salt content of the water in which theoyster lives.
珍珠的色泽受到作为其母体牡蛎种类及牡蛎生活水域的深度，温度和含盐度的制约。
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