It can loosely be described as travel that takes place at regular intervals—often in an annual cycle—that may involve many members of a species, and is rewarded only after a long journey.
它可以比较粗略地描述成是发生在固定周期（这个周期通常是一年一次）的包含某一个物种很多成员的集体旅行，并且只有在长途旅行后才有回报。
The annual jab fest for the seasonal flu is already underway, leaving many grown-ups wondering if the annual stick in the arm is right for them.
一年一度的季节性流感疫苗注射已经开始了，让许多成年人开始怀疑每年一次的流感疫苗注射是否适合他们。
This annual atonement must be made with the blood of the atoning sin offering for the generations to come.
他一年一次要用赎罪祭牲的血在坛上行赎罪之礼，作为世世代代的定例。
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