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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:Time relays are divided into two types: on-time delay type and off-time delay type, and their symbols are shown in the following figure. For the power-on delay type time relay, when the coil is powered on, the power-on delay type contact acts after the delay time (the normally closed contact is opened and the normally open contact is closed), and the contact immediately returns to normal after the coil is powered off; For the power-off delay type time relay, when the coil is powered on, the power-off delay type contact acts immediately (the normally closed contact is opened and the normally open contact is closed). After the coil is powered off, the contact will not return to normal until the delay time is passed.杰克·穆尼（Jack Mooney）开始在阳光普照的圣玛丽岛定居，他还有一些无法解决的谜团。 一位冠军扑克玩家，显然在一个震惊的观众面前在桌子上中毒。 一位小说家，在一个阴谋中被谋杀，比他写过的任何东西都更令人惊讶。 一位精神领袖，在所有嫌疑犯都是彼此的不在场时被勒死。 杰克的简洁风格掩盖了他敏锐的胸怀和坚定的决心。 他是一位出色的侦探，他将需要他所有的本能天才来解决这些令人困惑的谋杀案。加拿大CBC宣布预订11集新剧《Frankie Drake》。故事设定在上世纪二十年代（也就是加拿大历史上臭名昭著的华人移民禁令时期和反共时期），Lauren Lee Smith扮演多伦多唯一的女私人侦探，她专门承接警方不想办理也无力办理的案件。她知道如何运用自己的「女性资本」，但她并不总是在法律的范畴内行事。在搭档Trudy的帮助下，「Frankie与Drake侦探社」有能力迎接任何挑战。Frankie是个天不怕地不怕、非常前卫的女人，喜爱冒险，这也让她很容易惹麻烦，但她总能逢凶化吉。加拿大电视界的国宝级制片人Carol Hay和Michelle Ricci（《Murdoch Mysteries》）负责开发该剧。比拉尔梦想着去英国，在通过卡车偷渡失败之后他开始学习游泳，并结识了法国人西蒙。西蒙是游泳馆里的游泳教练，他被比拉尔的认真劲儿吸引，并逐渐对这个年青人产生好感。当西蒙得知比拉尔学习游泳是为了穿越拉芒什海峡时他曾试图劝阻，可是当他得知比拉尔去英国是为了见到女友米娜时，正在办理离婚手续的西蒙竟然决定帮助他...