“four-o'clock”很多人第一反应就是4点，但它除了这个意思之外，还可以指代一种紫茉莉花。这些花通常从下午晚些时候（大约4点）开始开放，然后花朵会整晚产生一种强烈的、甜甜的香味，到了早上又会永久关闭，所以外国人用“four-o'clock”来指这种花。

【例句】
Using four-o'clock shell of seed as main materials, phosphoric acid as activator, powdered activated carbon was synthesized under microwave radiation.
在微波辐射下，以紫茉莉种子壳为原料，磷酸为活化剂制得了粉状活性炭。

To provide important raw material for all kinds of new pigment used in food products, cosmetic and leechdom etc. Study on the stability of red pigment from common four-o'clock and the condition of extraction.
为生产各种食用品、化妆品、医药药品等色素新产品提供重要原料，研究了紫茉莉红色素的提取条件和稳定性。