If for example you switch workspaces frequently, and forgot to remove projects from previous workspaces, you could rest the Unit Test Environment back to its initial state.
例如，如果您经常切换工作区，并且忘了从先前的工作区中删除项目，您可以将单元测试环境恢复到初始状态。
Simply using the del key would remove the unit from the diagram only, not from the topology model.
简单地使用del键将只会从图表中删除单元，而不是从拓扑图模型中删除。
The repair plan calls for the astronauts to first remove the failed unit, temporarily stow it and then move the new pump into position.
修复计划要求宇航员首先移除损坏的单元并暂时存放，然后将新泵安装到位。
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