While a thread is running, either uploading or downloading, you can query it to check on its status to provide the user with feedback (e.g. a progress bar).
当一个线程在运行的时候，不管是上传还是下载，你可以查询进程状态并且给用户一个反馈（例如一个进度条）。
After the receptionist gathers room-query data, the next step is always to check the availability of the required type of room.
在接待员收集到客房查询信息后，下一步往往是检查所需类型的房间是否可入住。
Check each query filter, including its field name, operator, and filter value.
检查每一个查询筛选，包括它的字段名，操作者以及筛选值。
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