儲備 angolul

backlog [backlogs]▼(a reserve source or supply)
noun
[UK: ˈbæk.lɒɡ] [US: ˈbæk.lɔːɡ]

reserve [reserves]▼(that which is reserved or kept back, as for future use)
noun
[UK: rɪ.ˈzɜːv] [US: rə.ˈzɝːv]

reservoir [reservoirs]▼(place where anything is kept in store)
noun
[UK: ˈre.zəv.wɑː(r)] [US: ˈre.zəˌv.wɑːr]