长难句:The rats develop bacterial infections of the blood, as if their immune systems the self-protecting mechanism against diseases had crashed.
结构剖析:本句是一个主从复合句,逗号前为主句,后面的 as if 引导一个状语从句,使用虚拟语气,表示与事实相反;破折号之间的部分 the self-protecting mechanism against diseases 作破折号前的 immune systems 的同位语。
核心词汇:
develop 患(病)
mechanism 机制
参考译文:老鼠的血液出现了细菌感染,好像它们的免疫系统 对抗疾病的自我保护机制 已经垮掉了。
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