The first card is likely an anniversary date of sorts.

第一张卡片有点像 是约会周年庆祝类型的。

Vesuvius could not have erupted before  October 18. There is much speculation about the actual date of the eruption, and there is no firm  anniversary date for this huge natural disaster.

维苏威火山不可能在 10 月 18 日之前喷发。关于喷发的实际日期存在很多猜测，并且没有确定这场巨大自然灾害的周年纪念日。