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月六級真題（第一套）聽力 Section B
柯林斯高階英漢雙解學(xué)習(xí)詞典釋義
N-UNCOUNT
替代;替換;取代
If you refer to the replacement of one thing by another, you mean that the second thing takes the place of the first.