传统的优化过程用户不可控制。
The process of the ordinary optimization can not be controlled.
欠平衡钻井是不可逆的一次性过程，欠平衡钻井成败取决于多个可控因素与不可控因素。
UBD is an irreversible process and its success depends on the changeable and unchangeable factors.
在冲刺阶段中的许多的过程是未经确认地和不可控制的。
Many of the processes in the sprint phase are unidentified or uncontrolled.
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