据世卫组织建议，献血人数至少要达到国家人口的1%，一般就足以满足国家对安全血液的基本要求。
WHO recommends that blood donation by at least 1% a country's population is generally sufficient to meet a country's basic requirements for safe blood.
要是您想用一小块线程安全代码把要求同步的两个操作隔开，那么只使用一个同步块一般会更好些。
If you have two operations that require synchronization separated by a small block of thread-safe code, you are generally better just using a single synchronized block.
它的安全技术要求严格，一般有多种安全保障装置。
It's demanding security technology, in general there are a variety of security devices.
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