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Mathematics:"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. "板栗等人各自答应着，遂上车去了。该剧讲述了20世纪60年代初，穷学生刘争光怀揣乒乓梦想进城打球，通过不懈努力打进国家队，在国际赛场上为国争光的故事。闻此言，群臣起身，军士欢呼，百姓鼓掌。田遥脸更红了。