This means that even if multiple remote sources participate in a query, only one remote source or the federated server is active at any given moment.
这意味着，即使一个查询中涉及到多个远程数据源，在任何时候只有一个远程数据源或联邦服务器是活动的。
2
The best source of information for the moment is a theoretical model of where the cloud might be, taking into account the prevailing wind and other weather conditions.
考虑到盛行风与天气条件，目前最好的信息来源是尘用埃云的理论模型测定云层位置。
3
At the moment, they are her main source of income.