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Command mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.Support virtual rocker handle social capital;"Exposure compensation is also called EV, which is an abbreviation of Exposure Values and a quantity reflecting the amount of exposure. EV +/-commonly known as exposure compensation, it was originally defined as: when the sensitivity is ISO 100, the aperture coefficient is F1, and the exposure time is 1 second, the exposure is defined as 0, the exposure is reduced by one gear (the shutter time is reduced by half or the aperture is reduced by one gear), and the EV value is increased by 1. Increasing and decreasing exposure compensation depends on adjusting the rocker. The shooting environment is relatively dim and needs to increase brightness. When the flash cannot work, the exposure can be compensated and the exposure can be appropriately increased. "在阿尔卑斯山的秀丽山谷中，孤独少年邂逅被遗弃的受伤幼鹰，两个年轻的生命被命运绑在了一起，并成为彼此生命中最重要的伙伴，一段少年与鹰的故事就此展开。他们经历了磨合，经历了冒险，同样也经历了大自然的灾难洗礼。在相处过程中，雄鹰逐渐找到了自己的世界，少年也随之成长，最终懂得真正的爱不是拥有而是给它自由！