positive: "12PM 是中午<br>记得我刚来美国的时候,有门课程12PM开始。当时我问教授怎么晚上那么晚了还上课。他笑着说12PM是中午。<br>其实,中国人中分不清楚12AM和12PM的大有人在。我相信很多人把12AM当成是中午,12PM当成晚上。就168肯定就有很多人分不清楚。<br>规则参看:钱多多选股大赛规则截止日期: 11/15/2009 12:00am EST.<br>报名截止。<br>所以我在规则里面,尽量不用12,都用11:59啥的。<br>Are noon and midnight 12 a.m. or 12 p.m.?<br>This is a tricky question. The answer is that the terms 12 a.m. and 12 p.m. are wrong and should not be used.<br>To illustrate this, consider that ""a.m"" and ""p.m."" are abbreviations for ""ante meridiem"" and ""post meridiem."" They mean ""before noon"" and ""after noon,"" respectively. Noon is neither before or after noon; it is simply noon. Therefore, neither the ""a.m."" nor ""p.m."" designation is correct. On the other hand, midnight is both 12 hours before noon and 12 hours after noon. Therefore, either 12 a.m. or 12 p.m. could work as a designation for midnight, but both would be ambiguous as to the date intended.<br>When a specific date is important, and when we can use a 24-hour clock, we prefer to designate that moment not"
negative: 小朋友的睾丸上有积液,就是指精索鞘膜积液或睾丸鞘膜积液,发病原理是腹股沟区腹股沟内环口鞘状突没有闭合,肚子里的水通过腹股沟管流下来导致的一个积液。2岁之前是可以观察,2岁之后还没有好的基本不会自己好,有时会随着孩子的活动量增加而越发严重,对睾丸的压迫也会越来越大,所以建议还是尽早手术治疗。手术的方式一般分为两种,一种是腹腔镜,也就是平常说的微创治疗,肚脐眼打一个5mm的洞,从腹腔内探查,双侧的腹股沟用疝气钩针,置入将内环口结扎,手术就做好了。普通的开放手术就是在腹横纹做一个横行的皮纹切口,逐层切入,把内环口结扎分离,手术就做完了。两种术式术后的并发症还有手术的时间,以及恢复期也基本相同,一般7-9天的切口恢复,一个月之内避免剧烈活动也就好了。