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Matrix metering: It is also called evaluation metering on Canon cameras. It metering the whole area of the picture. The exposure values of each area are averaged in the camera to obtain an average value, thus obtaining the correct exposure of the whole picture.An even more important aspect is that the whole process is natural. It is sourced from nature, executed with natural means, and culturally returned to nature without undesigable side-effects. Other dyeing technologies can be done in a simple fashion, how, many of them require at least a small amount of chemical adjuvant, thought even tin, can cause harm. Using mud, all the necessary chemistry众人便目光炯炯地盯着他，等他说下文。嗯……杨长帆思索过后说道，明白了。"Her poems, placed in the poems of Chinese poetesses, are as striking as those of murderers placed in a group of good families-everyone else is dressed neatly, smeared with powder, sprayed with perfume, written in black and white, and can't smell any sweat, but she is smoky, covered with mud and sand, and there is obvious blood between the words." (Liu Nian, Editor of Poetry Journal)