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ADJ
(军队)征召的，征集的
If a person gets their call-up papers, they receive an official order to join the armed forces.
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N-COUNT
(服兵役的)征召令
A call-up is an occasion on which people are ordered to report for service in the armed forces.
例句
The call-up of National Guard and reserve units begun in late August.
国民警卫队和预备役的征兵工作8月下旬开始。
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N-COUNT
(对运动员的)征集令;征召
If someone receives a call-up to a sports team, such as the national football team, they are chosen to play for that team.