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Recent experiments reported that lanthanum hydride LaH$_{10{\\pm}x}$ ($x$$<$1) raises a superconducting transition temperature $T_{\\rm c}$ up to ${\\sim}$260 (or 215) K at high pressures around 190 (150) GPa. Here, based on first-principles calculations, we reveal the existence of topological Dirac-nodal-line (DNL) states in compressed LaH$_{10}$. 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