To order single element substitute "S" for "D" in model number.

如果需要订购单个加热元件，请将型号内的“D”用“S”替换。

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Therefore, the xsl:fallback element should contain whatever is needed to substitute for the single instruction that contains it.

因此，xsl:fallback 元素应该包含替换包含它的单一指令所需要的全部内容。

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What it means for you: Functional foods are one helpful element in maintaining a balanced diet, not a substitute for it.

功能食品是维持日常膳食平衡的有益因素，但不能代替一般食品。

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Mr. Chang says it's perfectly legitimate to substitute ingredients, or to make one element of a dish and use it any way that tastes good.

WSJ: The Momofuku Cookbook by David Chang