过去20多年的研究已经指出微量营养素的重要性—食物中发现的极少量的物质起着很大的作用。
Research over the past 20 years have pointed to the importance of micronutrients - substances found in small amounts in foods that make a big difference.
在膳食中添加洋葱和大蒜可以增加钙的摄入量，并提供铬、微量矿物元素，它们在维持人体血糖水平起着重要作用。
Adding Onions and garlic to your meals can boost calcium intake, and provide chromium, a trace mineral important in maintaining blood sugar levels.
大部分微量元素，包括锰和砷，通过自然过程中的岩石风化作用进入水体。
Most trace elements, including manganese and arsenic, get into the water through the natural process of rock weathering.
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