formation period

• 形成时期

formation period的用法和样例：

例句

1. They plan to the next step in-depth study of the comet dust grains in the meteorite ball formation period.
   他们计划下一步深入研究彗星尘埃中陨石球粒的形成时期。
2. The formation period of Maodun sub_arch is a key constraint on oil and gas exploration in Chagan depression.
   查干凹陷毛敦次凸起的形成时期是制约查干凹陷油气勘探的关键因素。