如有必要取消活动，所有持票人将获得全额退款。
Should it become necessary to cancel the event, all ticket holders would receive a full refund.
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should英 /ʃʊd/|美 /ʃʊd/
would英 /wʊd/|美 /wʊd/
解释
Should it + 动词原形为倒装形式，替代 If it should...，主句用 would 说明在这种可能情况下的处置方案，正式语气。
Should it become necessary to cancel the event, all ticket holders would receive a full refund.
Should it + 动词原形为倒装形式，替代 If it should...，主句用 would 说明在这种可能情况下的处置方案，正式语气。