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。
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.
所有种类的牡蛎(实际上也包括其他许多有壳的软体动物)都能分泌出珍珠，但是可食用的牡蛎出产的珍珠没有市场价值。
All types of oysters (and, indeed, many other shelled molluscs) can secrete pearls, but those from edible oysters have no market value.
珍珠的色泽受到作为其母体牡蛎种类及及牡蛎生活水域的深度，温度和含盐度的制约。
The pigmentation of a pearl is influenced by the type of oyster in which it develops and by the depth, temperature, and the salt content of the water in which the oyster lives.
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