Lombard Street to a china orange.

Lombard Street：伦巴第大街,为伦敦金融中心,现转喻为"英国金融界,金融市场".它常用在成语be Lombard Street to a China orange中,比喻"悬殊极大；几乎确定无疑,十拿九稳"（直译为：以全英国金融界的财富与一个橘子之比的输赢条件来打赌）.如：
It is Lombard Street to a China orange that he will succeed.十拿九稳他会成功.

Lombard Street to a China orange
[口]几乎确定无疑, 十拿九准