黒板
Schlüsselwörter
blackboard,
chalk,
board,
concept,
school,
text,
signs,
business,
word,
training,
black,
symbol,
lot,
write,
handwriting,
message,
icon,
green,
mathematical,
success,
writing,
back,
choice,
saviour,
character,
character,
word,
message,
communicate
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