保持牙齿洁净！
古希腊的女士则嚼某种树上的物质，这种物质能洁净牙齿，并保持口气清新。
Women in ancient Greece chewed a substance from a tree that cleaned their teeth and made their breath smell good.
古希腊的女士则嚼某种树上的物质，这种物质能洁净牙齿，并保持口气清新。
Women in ancient Greece chewed a substance from a tree that cleaned their teeth and made their breath smell good.
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