我们将总是将其控制在同一水平线上。
三价铬含量偏低时，根据计算加入适量草酸即可很方便地将其控制在最佳范围内。
The concentration of Cr(III)is easily controlled in optimal range by adding a proper amount of oxalic acid when Cr(III)content is low.
光学显微镜和穿透式电子显微镜要求将材料切成更薄的片，或在仔细观察前将其控制在玻璃下。
Light microscopes and transmission electron microscopes require that materials be sliced thinly, or trapped under glass before being examined.
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