Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first.

初部的成分，最早由原形成层形成。

The eggshells crackled, and the turkey babies fluttered and cheeped and snuggled against me.

蛋壳裂开了，初的火鸡拍动着翅膀，卿卿地叫着，偎依着我。

The cross section morphology and skin-core structure of PAN fiber in wet-spinning are analyzed by the means of electron probe microanalyser (EPMA) and scanning electron microscope (SEM).

结果明凝固浴温度会影响初纤维的横截面形貌与芯部结构。