一种或多种营养素的缺乏(如叶酸或维生素b6)将破坏情绪，因为这些营养物质辅助大脑功能的发挥，或帮助制造调节情绪神经化学物质。
It's too little of one or more nutrients, such as folic acid or vitamin B6, that undermines mood, since these nutrients aid in brain function or help manufacture nerve chemicals that regulate mood.
这类奶粉中发现含有三聚氰胺，它是一种制造塑料的化学物质，后来被无良厂家添加到食品里以降低向其中添加蛋白质的成本。
Melamine, a chemical used in the making of plastic, was found in the baby formula; it later emerged that unscrupulous manufacturers had been adding it to food products to cheaply boost protein values.
另外一种频率的光(UV)会促使我们的身体制造黑色素，这种化学物质会使我们晒黑。
Another frequency of light (UV) will cause our body to make melanin, the chemical that gives us a sun tan.
另外一种频率的光(UV)会促使我们的身体制造黑色素，这种化学物质会使我们晒黑。
Another frequency of light (UV) will cause our body to make melanin, the chemical that gives us a sun tan.
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