A leading concern is that someone with AIDS virus might give blood to a blood centre.

最主要的担忧是，艾滋病毒携带者可能会向血液中心献血。

People give blood to the centers, where it is kept until it is needed for medical purposes.

人们向中心机构献血，直到医疗需要前，这些血会一直贮存在机构里。

People get weak when they give blood.

献血会使人变得虚弱。

Blood donors give blood for use in hospitals.

献血者献血供医院使用。

I'm going to give blood as soon as I'm old enough.

当我到了年龄后我也会去献血的。