头期的英文：
cephalic phase

One of the best areas for the cannula is the cephalic vein in the shoulder area
肩部的头静脉是放置静脉导管最好的部位之一。

Objective: To study the safety of elective cephalic mild hypothermia for treatment of newborn hypoxic iochemic encephalopathy( HIE).
目的:研究选择性头部亚低温对足月新生儿缺氧缺血性脑病(IE)疗的安全性。

An increase in extracellular potassium does in fact shift the pacemaker within the sinus node from the cephalic to the caudal portion
细胞外液钾的增高确实能使窦房结内的起博点从头侧移向尾侧。

The phase is insensitive.
这个相位不灵敏。

Phase: Seed phase, Expansion phase, Spin-off.
投资时期：种子期、展期和让产易股。

This will be useful in later design phases.
这样大家同时都能看到，这会对后面的设计阶段非常有用。

The problem has many phases.
这问题是多方面的。

It was a very important phase of history.
它是一个非常重要的历史阶段。