A spring assembly includes a substrate, an inner coil spring, and an outer coil spring arranged outside the inner coil spring. In one example, the carotenoids comprise at least S,S\u2032-astaxanthin derived from Haematococcus pluvialis, and one or more of lutein andor trans-zeaxanthin or meso-zeaxanthin. The first display cells include the first and second auxiliary electrodes, and the second display cells each lack at least one of the first and second auxiliary electrodes. The master cylinder and the clutch pedal are mechanically connected through a push rod. A microstructure is also provided. The invention utilizes a fuzzy inference system to integrate mesh attributes and estimate the cost in removing certain data, which serve as a criteria for mesh simplification.