These rules are another way to help keep the blood supply pure.
这些规则是帮助保持血液供应纯净的另一种方式。
The government agency says new rules are designed to improve the blood supply system.
政府机构表示，新规定旨在改善血液供应系统。
The government agency says new rules are designed to improve the blood supply system.
政府机构表示，新规定旨在改善血液供应系统。
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