案例：查找天在文本中的位置，查找C在文本中的位置，find区分大小写，所以最后一个会错误 This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information. Impar-necessary Impar-necessary In August 2015 Microsoft announced that Bing News for mobile devices added algorithmic-deduced "smart labels"... https://israelvcdhh.look4blog.com/74226787/una-revisión-de-tipos-de-mediciones-ambientales-sst