Depending on the style being used, you have to control both the writing direction of the identifiers used within formulae, and, separately, the layout direction of the formula itself.
根据所使用的样式，您必须既能控制公式中所用标识符的书写方向，还要能单独控制公式本身的布局方向。
An Israeli company, for example, supplies all the ink used for its printed batteries and maintains tight control of the formula.
例如，一家以色列公司提供用于印刷电池的所有墨水，该公司严格控制着配方。
Scientists at the Centers for Disease Control and Prevention tested the formula for the presence of perchlorate, a chemical used as the main ingredient in solid rocket fuel.
疾病预防控制中心的科学家专门针对高氯酸盐对配方奶进行了检测。
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