active-backup模式可以和任何二层（Layer-II）交换机一起工作。
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The dual "TRUE (Three-layer Responsive Ultimate Engine) II" image processing engine dedicated to Foveon X3 direct image sensors improves the processing speed and overall quality of the final image.
ENGADGET: Sigma DP3 Merrill packs a Foveon X3 sensor and a fixed F2.8, 75mm-equivalent lens
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