Innovations in recent years to make testing methods more sophisticated include thermal imaging, light analysis using lasers, and DNA profiling.
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，这一点在safew官方版本下载中也有详细论述
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Yes… and no! Actually during the image build, we must use dnf (because we’re not in a running system) and we can modify any directory as we would in a classic distro. It’s only once the image is deployed that we need to use rpm-ostree to manage packages.