The head of the list containing all children created by P.
创建的所有子进程链表的头。
Set the "Sketch" Opacity to 20%. Use the Pen Tool (p) to draw the head shape.
设置“素描”不透明度为20%。使用钢笔工具(P)绘制的头部形状。
The temperature reiteration rate was lower in head temperature control instrument group (P< 0.01).
体温反复者以颅脑降温治疗仪最低（P<0.01）；
The temperature reiteration rate was lower in head temperature control instrument group (P< 0.01).
体温反复者以颅脑降温治疗仪最低（P<0.01）；
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