ZPA

Seasonal variations of time determination of zat, zpa, and Za at Shanghai Observatory

上海天文台ZAT、ZPA、ZA三架仪器测时结果的季节性变化

During the development of the limb, Sonic hedgehog ( SHH) protein plays a key role as a mediator of the zone of polarizing activity ( ZPA).

在肢体发育中，SONIC HEDGEHOG（SHH）蛋白作为极化区（the zone of polarizing actiVity，ZPA）的调节因子，发挥着十分重要的作用。

Or, you can type python zpasspwd. py inituser and follow the prompts.

或者你可以输入pythonzpasspwd. py初始化用户并且跟着提示做.