In writing the thesis there are several steps: selecting a subject, drawing materials, planning a thesis, writing and revising.
文科类学术论文的撰写可按选题、取材、谋篇，行文与修改等几个步骤进行。
Any drawing materials are acceptable.
任何绘画材料是可以接受的。
Many harmful pollutants to human and environment can be produced in the production process of jet drawing materials, because of the unique production technology, equipment, and raw materials.
喷绘写真材料在生产过程中，由于其特殊的生产工艺、设备、和原材料，产生了对人体和环境有害的污染物。
Many harmful pollutants to human and environment can be produced in the production process of jet drawing materials, because of the unique production technology, equipment, and raw materials.
喷绘写真材料在生产过程中，由于其特殊的生产工艺、设备、和原材料，产生了对人体和环境有害的污染物。
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