只有运行时期间存在源数据时，才会执行任何对可选源数据进行操作的转换，否则，将不会发生转换。
Any transformations operating over optional source data will only execute if the source data exists during runtime. Otherwise, the transformation will not occur.
如果您只有一个应用程序，或者您所有的应用程序在运行时迁移之前已经进行了迁移，那么滚动迁移将会在大约几个小时或几天内完成。
If you have a single application, or if all your applications are migrated prior to the run time migration, the rolling migration may be accomplished in a matter of hours or days.
它还要求必须要每四小时打一次盹，只有在近乎完美地坚持至少一个月之后才能进行时间上的小小的调整。
Naps must be taken every four hours on the dot; small deviations become possible only after at least a solid month of perfect or darn-near-perfect adherence to the schedule.
如果用字符串，进行了错误的重构，那么只有在运行时你才能知道问题所在。
If you just use a string, and perform a bad refactoring, then you won't know about the problem until runtime.
录像机中的跟踪系统只有在以标准速度运行时才能进行准确跟踪。
The tracking system in video tape recorders (VTR) can only track accurately at normal speed.
只有对其进行时程分析，才能对其安全度进行全面评估；
Unless analyze time history, it could go on the overall assessment of safety.
他们发现只有一件事在单独进行时比有伴更快乐- - -那就是祈祷。
They found only one activity during which people were happier alone rather than with other people - and that was praying.
据护士说，手术进行时医生已帮妈打了十次止痛药，不能过量，所以手术完成后不能再打因为怕有生命危险，她能做的就只有忍。
The nurse told me the doctor had given 10 painkiller injections to mom during operation, cannot over injection else it might be dangerous for her, what she can do is be patient.
据护士说，手术进行时医生已帮妈打了十次止痛药，不能过量，所以手术完成后不能再打因为怕有生命危险，她能做的就只有忍。
The nurse told me the doctor had given 10 painkiller injections to mom during operation, cannot over injection else it might be dangerous for her, what she can do is be patient.
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