考虑到时间问题，需要创建一个子系统，该子系统能够处理这些长时运行任务，向用户显示处理进度，并编制需要采取的后续步骤。
Because of the time involved, a sub-system needed to be created that could handle these long running tasks, keep the user informed of progress, and choreograph the next steps that needed to be taken.
因此在选择污水及污泥处理工艺时，应当考虑对后续工艺及最终处置的影响。
When treatment technique for sewage and sludge is selected, the factors of follow-up processing and final treatment should be considered.
因此在选择污水及污泥处理工艺时，应当考虑对后续工艺及最终处置的影响。
When treatment technique for sewage and sludge is selected, the factors of follow-up processing and final treatment should be considered.
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