Old Bgmbgmbgm

Imagine a scene where there is an electric lamp with only one switch on it. When the light is on, press the switch at this time and the light will switch to the off state. Press the switch again and the light will be turned on again. The behavior of the same switch button is different in different states.插队时期，孙子旺与张大年同时爱上了善良、美丽、乐于助人的女知青秀。孙子旺回城后，秀与张大年的恋情发展迅速并怀上了他的骨肉，为了前程，张大年劝秀打掉孩子，秀却迅速失踪从此音讯全无。提前回城里的孙子旺全然不知秀与张大年之间发生的一切，得知秀失踪的消息，四处寻找不见，只好带着遗憾遵循父母之命与杨喜莲结为夫妻，而张大年则带着对秀的愧疚远走美国。秀失踪后生下一对龙凤胎，因无力抚养只好将孩子送人。父母对她未婚先孕不能谅解，秀在抑郁中英年早逝。秀的弟弟在姐姐遗物中发现她写给龙凤胎父亲的信，经打听，误以为当年与姐姐产生恋情的人是孙子旺，于是将信送给了孙子旺。孙子旺与妻子杨喜莲结婚二十年至今膝下无子，这封蹊跷的来信，犹如一枚重磅炸弹，使二人本就微妙的夫妻关系更是雪上加霜。阴差阳错中，杨喜莲断然结束了与孙子旺的婚姻。孙子旺带着离婚的伤痛，踏上了赴美代故人寻子的漫漫征程。孙子旺此行除了完成秀的遗愿，同时也希望能解开心中的谜团，到底是哪个负心人毁了秀的一生。他断然没有想到那个人竟会是自己的好友张大年。张大年在美这是玄武王府，在自家门口被人欺负了，真是太可气了。2. Ships of 12m or more but less than 50m in length:Completely crazy and ridiculous侠义。? This mode is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while the multiple factory method mode provides multiple factory methods to create the object separately. Diagram: