The present research suggests that the spray process can be divided into two stages: primary spray and secondary spray.
本文认为，燃油雾化过程可分为两阶段：一次雾化和二次雾化。
The developmental process of fibers could be divided into three continual stages such as fiber initial formation and the formation of primary wall and secondary wall.
纤维细胞的发育过程可以分成明显的三个连续阶段：纤维原始细胞形成期、初生壁形成期和次生壁形成期。
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