N-COUNT (要求某政党议员参加议会并按照要求就某议题投票的)紧急指令 A three-line whip is a situation where the MPs in a political party are ordered to attend parliament and vote in a particular way on a particular issue. (要求某政党议员参加议会并按照要求就某议题投票的)紧急指令 [British]