ultramicrofossil

例句：

1. 1. The discovery ofthis ultramicrofossil has sparked a new era in paleontology.
   这种超微化石的发现为古生物学带来了一个新的时代。
2. 2. The teamspent months analyzing the ultramicrofossil to determineits age and origin.
   该团队花了数月时间分析超微化石，以确定其年龄和来源。
3. 3. This ultramicrofossil is believed to have beenburied for millions of years under the seabed.
   这种超微化石被认为已经埋藏在海底数百万年。