养 (yǎng) = 'nourish/raise' +
护 (hù) = 'protect'. Used across infrastructure (
道路养护 road maintenance), construction (
混凝土养护 concrete curing), health (
皮肤养护 skincare), and pets/plants.
维护 (wéihù) overlaps but is more abstract —
维护 a system or rights,
养护 a physical thing that needs ongoing care.