摘要： In the comparison with SARS-CoV of 2003, SARS-CoV-2 is extremely well adapted to the human populations and its adaptive shift from the animal host to humans must have been even more extensive. By the blind watchmaker argument, such an adaptive shift can only happen prior to the onset of the current pandemic and with the aid of step-by-step selection. In this view, SARS-CoV-2 could not have possibly evolved in an animal market in a big city and even less likely in a laboratory. Discussions of the origin of SARS-CoV-2 need to factor in the long process of adaptive shift and some models have indeed advanced in that direction.
摘要：A Cr/Cr2N/CrN multilayer coating with a thickness of 24.4 mu m was deposited by multi-arc ion plating. The coating was systematically characterized by field emission scanning electron microscopy [FESEM], X-ray photoelectron spectrometry [XPS], energy disp