prothallium

例句：

1. 1.The protagonist of the novel is a young woman who dreams of becoming a scientist.
   小说的主角是一位年轻女子，她梦想成为一名科学家。
2. 2. The platinum ring symbolizes love and commitment.
   铂金戒指象征着爱情和承诺。
3. 3.The platinum market is highly volatile, with prices fluctuating daily.
   铂金市场非常不稳定，价格每天波动。