serum

1. N-VAR A serum is a liquid that is injected into someone's blood to protect them against a poison or disease. 免疫血清

...painful injections of anti-cancer serum. …令人痛苦的抗癌血清注射。

2. N-UNCOUNT Serum is the watery, pale yellow part of blood. 血清

The strip, which accepts blood, serum or plasma, is inserted into the analyser. 涂上了血液、血清或血浆的测试带被插入分析器。