There is a constant need for regular blood supply because blood can be stored for only a limited time before use.
由于血液在使用之前只能储存有限时间，因此经常需要定期供应血液。
If you're taking it, your doctor should be continually monitoring its effect via regular blood tests (at least once a month).
如果开始使用它了，你的医生应通过定期血液检查不断监测其影响(至少每月一次)。
Many people who look lean may assume they are healthy and may not be as likely to get regular blood tests to check their cholesterol and blood glucose levels.
许多看起来很苗条的人也许会自认为很健康，因此很可能不怎么会定期进行检测胆固醇和血糖水平的血液化验。
Health care professionals in Kenya are also pushing for what they call a structured donor system that involves regular education campaigns,blood drives, and mobile donor clinics to reach office workers and people living in rural areas.
VOA: standard.2010.06.04
There is a lack of regular running water in several areas, while doctors at the local hospital admit they do not always provide blood to patients that is tested for the HIV virus that causes AIDS.
VOA: standard.2010.02.14
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