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: <pre>你好!女性出现下腹疼痛,多数是妇女病,也可以有内科病和外科病。因此,女性一旦出现下腹疼痛,应认真辨别疼痛性质,以求及时得到治疗。<br>1、由炎症引起的疼痛:多见于附件炎和盆腔炎,多发生于育龄妇女,疼痛在一侧或两侧,同时伴有白带增多。慢性者往往呈现出隐痛,腰酸痛或有坠胀感;急性者往往表现为腹痛拒按,并伴有发烧。<br>2、由月经引起的疼痛:妇女在经期出现下腹疼痛和全身不适多是生理现象,若疼痛剧烈则为痛经。青春期多为原发性痛经,可自愈;而经后发作的痛经多为某种疾病导致的,应早早就医,不能用止痛药来解决问题。<br>3、由某种妇科疾病引起的腹痛:如子宫内膜异位症往往在卵巢、子宫、直肠附近形成包块,可使经前期及经期腹痛加剧,性交痛亦是其特点之一。又如盆腔出血或瘀血内停,可导致盆腔疼痛,疼痛常表现为一侧大腿根部。<br>4、由排卵引起的腹痛:在排卵期内出现下腹部胀痛感,这是由于卵泡破裂所致。一般来说,这种疼痛并不影响健康,也无不良后果,但有极少数人因排卵期卵泡破孔较大,损伤小血管造成卵巢破裂使腹腔内出血,形成妇科急症,须到医院治疗。 5、由生理畸形引起的腹痛:常见的有处女膜闭锁、阴道横膈等,症见青春期月经来潮、经血排出受阻而腹痛,其疼痛与月经关系甚为密切,且呈周期性发作,需手术矫治。<br>6、由肿瘤引起的腹痛:肿瘤引起的腹痛、腹胀、腰痛和下坠感,一般是持续存在的。若肿瘤发生扭转、破裂、出血,则往往出现突发性腹痛,这是肿瘤的“自我暴露”,通常需要立即手术治疗。<br>7、由妊娠引起的腹痛:月经过期或已知怀孕的妇女,突然下腹正中阵阵收缩样痛或阴道流血,多见是流产先兆。宫外孕引起的下腹疼痛,通常来热凶险。由于腹腔内出血,病人会感到肛门下坠、便意频频、脸色苍白、头晕疲软,甚至出现休克状态,要立即手术。<br>8、由急性阑尾炎引起的腹痛:疼痛始于上腹,后逐渐转移到右下腹,同时表现为恶心、呕吐、不想吃东西、发烧、右下腹不敢按压。此病应尽快上医院急诊。<br>您具体是什么病症需要到当地正规医院做进一步检查确诊,才可以结合你目前实际情况采取相应治疗措施</pre>