因此，前脑的绝缘化是在青少年晚期和二十岁初期完成的。

So it is with the forebrain's myelination during the late teens and early 20s.

youdao

那时，我们还处在太空自动化、太空探索和太空研究时代的初期。

At that time, we were at the beginning of the age of [space] automation, discovery and research.

youdao

该集团建立初期只生产轿车，然后产品很快多样化，领域涉及商用车辆、船舶、飞机、火车、农用拖拉机及建筑机械等。

Initially the group set up production of cars, then the product will soon diversified in the fields of commercial vehicles, ships, aircraft, trains, farm tractors and construction machinery.

youdao