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1. Oxford Dictionary

   shin-cracker

   • n.
     (in opal mining) very hard, brittle rock that splinters easily

   • noun: shin-cracker

2. • 釋義

   n.

   名詞

   • 1. Australian informal (in opal mining) very hard, brittle rock that splinters easily in a hole of that depth you would first sink through about 10 or 12 feet of shin-cracker