英语语法分析

The first task is to extend the underpainting using oils.

第一项任务是将打底用的油。

The purpose of painting thinly in oil at the beginning is to be able to see the guiding acrylic underpainting.

画中的薄油开始时的目的是能够看到的指导丙烯酸打底。

By using an acrylic layer as an underpainting one has all the advantage of an oil underpainting while also saving time.

通过使用作为打底人所有的石油打底优势，同时也节省了时间的丙烯酸层。