In fact, you may have heard about the new superbugs, which are antibiotic-resistant bacteria that have developed as a result of overprescribed antibiotics.

出自-2017年6月听力原文

In fact, you may have heard about the new "superbugs", which are antibiotic-resistant bacteria that have developed as a result of overprescribed antibiotics.

2017年6月六级真题（第一套）听力 Section B