[作文试题]一节生物课上,老师问道:“大家想想,用酒精消毒时,什么浓度为好?”学生齐声回答:“当然是越高越好啦!”老师说:“错了。浓度太高的酒精,会使细菌的外壁在极短的时间内凝固,形成一道屏障,后续的酒精就再也杀不进去了,细菌在壁垒后面依然活着。最有效的做法,是把酒精的浓度调得柔和些,润物细无声地渗透进去,效果才很好。” In a biology class, the teacher asked, “We think about what concentration is good when we are sterilized with alcohol?” The students answered in unison: “Of course, the higher the better,” said the teacher. Said: "Wrong. Alcohol with a too high concentration will cause the outer wall of the bacteria to freeze in a very short period of time, forming a barrier, the subsequent alcohol will no longer be able to kill, and the bacteria will remain alive behind the barriers. The practice is to make the concentration of alcohol softer, and the moisturizer penetrates silently into the effect.”