事实上，卡梅伦的承诺应当是本次大选中最具连锁反应的重大议题：如果他连任，则公投可期；如果米利班德当选，则一切照旧。
Indeed, Cameron’s promise is arguably the most consequential issue at stake in the British election: if he remains Prime Minister, there will be a referendum; if Miliband takes over, there will not be.