“应天”是个多义词，它可以指应天（汉语词汇）, 应天（西夏襄宗年号）, 应天（大燕刘守光年号）, 应天（商丘古称）, 应天（越南前黎朝年号）, 应天（南京古称）。
自旋-仰角跟踪模式最早由陈应天教授等人提出。
The spinning-elevation tracking method was first invited by Chen, et al.
您应及早申请，最早可提前于课程开始前的120天。
You should apply early, up to 120 days before classes start.
世卫组织建议，应将具有明显暴露史的旅行者作为接触者对待并将其置于监测之下21天，在此期间应每天监测其体温。
WHO recommends that travellers with a clear exposure history be treated as contacts and placed under surveillance for 21 days, during which time their temperature should be monitored daily.
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