The standard answer to the problem of blood donations is simple: Get more donors.
对于血液捐献问题的标准答案很简单：更多的捐献者。
Your cholesterol levels are determined through a simple blood test, so you'll need to get your arm tapped for the red stuff.
你的胆固醇水平通过简单的验血决定，所以你需要将你的手臂伸向红色的东西。
Lab scientists can reconstruct simple black-and-white images the subject is viewing by analyzing the blood flow in the brain's visual cortex.
通过分析大脑视觉皮层的血液流动，实验室的科学家能就重组实验对象见到的简单黑白图像。
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