最大（通常也是最贵）的当属全画幅。 之所以称其为全画幅，是因为感光元件和35mm胶片尺寸大小相似。
The largest (and most expensive) DLSR format is full frame (so called because the sensor is the same size as a frame of 35mm film).
集合物件已经达成它的最大大小，而且你正在尝试增加另外的一个元件（物件单位） 。
The collection has reached its maximal size, and you are trying to add another element (objects unit).
负反馈的最重要作用在于使放大器总增益不至于因基本放大器增益的改变而变化，其总增益的大小完全取决于反馈网络的元件参数。
The most important effect of this is to make the overall amplifier gain almost immune to changes in the amplifier unit gain, and dependent almost entirely on the feedback network components.
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