Do not take a double dose of this medication. Do not double up the dose to catch up.

而就文中所介绍的药物，应当是“切勿一次服用两倍剂量”。

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The vaccine may require a second dose three weeks after the first, and it may take another two weeks for the body to build up full immunity, the C.D.C. says.

疾控中心工作人员告知，注射过第一针疫苗的人，需要隔两周再去注射第二针，再经过两周时间，机体才能完全建立起猪流感免疫机制。

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That's why cameras use flashes in low-light environments: the flash gives the camera's sensors an extra dose of photons, the particles that make up light, Fergus says.

费格斯说，照相机在光线昏暗的情况下需要使用闪光灯的原因是：闪光给照相机传感器提供大量额外光子，光线正是由这种粒子组成的。

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U.S. obstetricians have long told nauseated pregnant women how to mix up the right dose themselves.

NPR: FDA Approves Return Of Drug For Morning Sickness

The New York-based drug giant says last night it received news that in a study, sponsored by the National Cancer Institute, on using Celebrex to prevent cancerous colon polyps, the drug more than doubled the risk of heart attacks and strokes. (The risk showed up with the highest dose of Celebrex.) That study, called the APC trial, has been halted.

FORBES: Pfizer's Heart Attack

In the first generation scanners, the dose was estimated to be up to 600 chest x-rays, but more recent technology has reduced the dose to nearly one fifth of the original estimates.

FORBES: Coronary CT Scans May Save You (And Your Hospital)