黑板 /hēibǎn/ angolul

blackboard [blackboards]▼(a surface that can be written upon with chalk)
noun
[UK: ˈblæk.bɔːd] [US: ˈblæk.ˌbɔːrd]

board [boards]▼(short for blackboard, whiteboard, etc.)
noun
[UK: bɔːd] [US: ˈbɔːrd]

chalkboard [chalkboards]▼(slate board for writing on with chalk)
noun
[UK: ˈtʃɔːk.ˌbɔːd] [US: ˈtʃɔːk.ˌbɔːrd]