求翻译：When I was young, every Indian had at least three names during his lifetime. His first name was given to him at birth. It described something that had happened at that time. For example, when one man among the Blackfoot was born, the woman who was helping his mother went down to the river to get some water with which to wash him. When she returned to the house, she remarked that she had heard a wolf howling across the river. "Then," said the baby's mother, "I shall call my son Howling-in-the-Middle-of-the-Night."是什么意思？

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