uncontrollable risk (those risks to the project which, if occurring, cannot be mitigated in any way by the project manager or the team, are listed in the project plan and require the prior direction of the project's sponsor before any further action can b是什么意思 uncontrollable risk (those risks to the project which, if occurring, cannot be mitigated in any way by the project manager or the team, are listed in the project plan and require the prior direction of the project's sponsor before any further action can b怎么读