在印跡水中添加甘油或酒精是否有助於更長時間地保持頻率？還是它必須是一種礦物質，例如鹽？
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Imprint for both will last for 30 days.
Imprint for both will last for 30 days.
兩者的印記將持續 30 天。
兩者的印記將持續 30 天。