a chemical substance that is found in very small amounts
a chemical substance that living things, especially plants, need only in very small amounts to be able to grow well
nguyên tố vi lượng
/ˈtreɪs elɪmənt//ˈtreɪs elɪmənt/a chemical substance that is found in very small amounts
a chemical substance that living things, especially plants, need only in very small amounts to be able to grow well