问题描述：
请大家帮我分析这句,when、that、which各在里面起什么作用,when的里面翻译什么意思,谢谢
when the woman shook her head in bewilderment, harry went on to explain that 'myrolite' was a hard, amber-like substance which could be used to remove freckles.
when the woman shook her head in bewilderment, harry went on to explain that 'myrolite' was a hard, amber-like substance which could be used to remove freckles.
问题解答：
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