Recent advancements in ultradeep drilling have led to a worldwide surge in ultradeep wells, making them pivotal to the energy industry.

Such microelements include a "rotating table" for eating and working, which tucks away into a row of built-in cabinetry that is located along one wall.

D. I. Arnon, Microelements in Culture-Solution Experiments with Higher Plants, American Journal of Botany, Vol. 25, No. 5 (May, 1938), pp. 322-325 ...

"The feedstock, as small as it is (only 2.3 millimeters thick), requires an exact proportion of microelements," said Wang Huimian, senior engineer of Taiyuan Iron and Steel.