be sent in advance 事先派出的 ; 先遣
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Thee heavy luggage was sent in advance.
笨重的行李已事先送去。
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A person, such as a herald, sent in advance.
被派在前面的人，如使者等。
Traffic categories within each node are introduced so that cooperative frames can be sent in advance.
第二，在节点内部设定业务流优先级，确保协作重传的帧能被优先发送；
Sometimes there's two or three in a given evening you might attend where you have sent in usually a contribution in advance.
NPR: The Work and Ethics of Lobbyists
He said that on Friday, 25 January, the former paramilitaries submitted a "supplemental statement by way of brief responses" on a list of topics that the tribunal had sent to them in advance of the cancelled meeting.
BBC: Smithwick Inquiry: Former IRA members refuse to testify
Invitations are sent out, parties planned in advance and purchases made in anticipation of a once a year event.
FORBES: St. Patrick's Day Expected To Ring Up Big Bucks For Retailers
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