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The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:李朝伟是一名自由自在的，可以在各地五星级酒店吃住行的试睡员，测试完最后一家酒店，他就可以拥有“五星”试睡员资质，没想到的是，从天而降到自己床上的女孩，使他无端被卷入“艳照门”，对一个试睡员来说，这是一个很大的“污点”。李朝伟原以为这只是酒店要挟改评级的一种卑劣手段，没有想到更大的阴谋却在后面……Grandma Lily picked up the three socks already prepared on the table and hung them by the fireplace in turn.I thought this thing was the same as before, Is to rush up and bite people, So we're just shooting with guns, When the distance is close, throw it with a grenade. At the most dangerous time, even mines are thrown out, At that time, the 'round head' anti-infantry mine (still referring to Type 72 anti-infantry mine) had a 'bolt' (i.e. Safety ring) under it. Just pull it out, Throw it out like a grenade, But more powerful than a grenade, As soon as a large area is blown up, But because it is heavier, More than three grenades, Therefore, those with weak throwing ability generally dare not use it like this. Because I'm afraid I can't throw it out of the safe range and blow it up to myself, But fortunately, whatever it is, As long as you want to attack, It must be an attack on the ground, We have a great advantage from a high position. Throwing explosives from high to low can increase the throwing distance, Even if you can't throw it far away, After landing, you can also roll down a little further distance. Therefore, some comrades who throw grenades not far away can also throw mines away from a safe distance to strike the enemy. Then there is the explosive cartridge, The vast majority of people can't throw out three pieces of explosive cartridges in one go like a company commander. And it is too wasteful to throw them all like that, So he threw the explosive cartridges out one by one, When the "big grenade" is used, The reason why I dare to do this and make such "rich" moves is because there are not many others in our positions, that is, grenades, mines and explosive cartridges are plenty of explosives, and many to "tube enough", thanks to these, otherwise in the period of time without artillery support, the Vietnamese army's offensive forces increased several times, and the guns in hand alone could not hold up completely.　　当太子无鸾出现在婉后面前，婉后抱住少年时的情人，仿若生死两别。但是无鸾一声：“母后”将她残酷的推开。她不再是无鸾少年时习武的陪伴者，她不再是无鸾的后母，此时，她将成为新的皇后，成就新的皇权，并以她昔日的身份和荣耀，助篡位者猖。声bō继续散播，甚至是成为的群上都能感应到，历史注定会铭记这个震耳yù聋的声音………,检阅完军队之后，尹旭在众人的簇拥下返回越国王宫。