IMabbr.脉冲调制（=impulse modulation)abbr.感应电动机（=Induction Motor)IMLASTn.国际科技休闲活动网

1. Researchers took periodic blood tests before and after vaccination to determine their level of immunity against shingles.
   接种前后研究者均定期抽血化验，以确定其对带状疱疹的免疫水平。