They acquire the spoken form of their mother tongue during the formative period of language acquisition.

在语言习得的形成阶段，他们会自然习得母语的口语。

The Cambrian is famous for being a pretty  formative period in the history of life on Earth.

寒武纪因地球生命史上的一个相当重要的形成时期而闻名。

And it isn't until recent years that people have realized the significance of documenting the glory, the beauty and the culture of China at a very formative period.

直到近年来，人们才意识到记录中国形成阶段的光荣、美丽和文化的重要性。”

It was a formative period setting the stage for personal computers, worldwide web, self-driving cars virtual reality, and many other topics we'll get to in the second half of this series.

这是一个形成阶段，为个人电脑、万维网、自动驾驶汽车虚拟现实以及我们将在本系列的后半部分讨论的许多其他主题奠定了基础。