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1. Oxford Dictionary

   angle of repose

   • n.
     the steepest angle at which a sloping surface formed of loose material is stable

   • noun: angle of repose, plural noun: angles of repose

2. • 釋義

   n.

   名詞

   • 1. the steepest angle at which a sloping surface formed of loose material is stable the angle of repose will vary locally according to the mechanics of shape and strength