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training ball /ˈtɹeɪnɪŋ ˈbɔːl/ n

中文：训练用球

中文 · 训练用球Español · pelota de entrenamientoFrançais · balle d’entraînement
Meaning：High-bounce ball marked with a blue dot; it is used by beginners.
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Squash ball

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