And, apparently, that day has come because seemingly routine operations such as knee replacements are now much more hazardous due to the looming threat of these infections.
2017年6月六级真题（第一套）听力 Section B
柯林斯高阶英汉双解学习词典释义
VERB
（庞然大物或形状模糊之物）耸现，出现
If something looms over you, it appears as a large or unclear shape, often in a frightening way.