Researchers now plan to investigate the optimal dose schedule for injection of the virus.

研究者目前正测试该病毒注射的最佳剂量方案。

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The optimal dose for many vitamins and minerals is unknown and some can be toxic in high doses.

很多维生素和矿物质的最佳用量还不知道，其中有些如果大量服用还是有毒的。

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Clinical studies under way will provide additional information about the optimal dose in children.

正在进行中的临床研究将提供有关儿童最佳剂量的其他信息。

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Although it is sold over-the-counter, melatonin isn't approved by the Food and Drug Administration and researchers disagree on the optimal dose.

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"It's going to be a few years until we really know whether or not people need another booster dose, and what is the optimal timing for that booster dose" for Tdap, because it is so new, Martin said.

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Engineers had to calculate the optimal air flow into the chamber to ensure that patients would breathe a full dose each time.

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