英语语法分析

The main contents can be summarized as follows: Firstly, the raspite PbWO4 nanobelts with length up to a few millimeters were obtained by a facile composite-salt-mediated synthesis method.

本文的主要研究内容包括：首先，以复合熔融盐为反应媒介合成了长达毫米数量级的单斜钨酸铅纳米带。