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Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.刘井儿无法，只得任由她去。天水围位于香港新界元朗区，原是一条小围村，1980年代末被港英政府发展成为以住宅为主的新市镇，但今天它的30万居民多为底层劳工（其中有诸多新移民及大陆新娘）。由于天水围发生过多起震惊港媒的伦常惨案，该地被视作“悲情市镇”，可是其中多数居民平日其实过着与其他港人并无差异的生活，相依为命的贵（鲍起静）与张家安（梁进龙）母子便是如此。年纪轻轻便守寡的贵14岁出来做工，先后供两个弟弟念完大学，如今他们做成富贵人，她依旧是超市女工一名，但是她并不觉上天待她刻薄，每日生活都很乐观。张家安是乖乖仔，会考完毕没找暑期工做的他多数时候会呆在家里睡觉或看电视，外出见朋友、参加活动的时间非常有限。母子一起坐下吃晚饭聊天时，说的也是该买哪家报纸一类再平常不过的话。与他们住在同一栋楼里的阿婆梁欢（陈丽云）是新搬来的住户，她每日过着郁郁寡欢、斤斤计较的孤独生活。凭着曾在市区卖过果蔬的经验，她在贵工作的超市找到份工。起初，她与贵不过是见面点头之交，且神情相当冷漠，但慢慢地，贵的慷慨与无私融化了她心中的冰山。而贵在了解到她的心结后，给了她更多温暖，两人渐渐亲如母女。日子一天天过，张家安亦从母亲身上、几件平常事中了解到生活的多面，舅舅们并没在心理上疏远他们母子，每人都有自己的生活要过。他做好了若是会考成绩不理想，便出来做事的准备。Cause Analysis1939年，抗日战争转入艰苦的相持阶段，日寇侵略的铁蹄在湖南战场受阻，湖南成为抗日战争正面战场的最前沿。觉得此事非同小可，这可不是她一家的事，这中间牵涉到豪门权贵，因而万不可对这制度有毁谤贬低等语。该剧讲述了农村姑娘白小梅由于心脏病，带着一幅梅花图住进了医院，却意外死在了手术台上，这场医疗事故引出了一系列的恐怖事件的故事。