Up to that point, it was the largest transaction of Railroad bonds in US History.

在那之前，这是美国历史上最大的铁路债券交易。

'Sell up' means to complete a large, important transaction, like selling a house or a business.

“Sell up”的意思是完成大数量的、重要的交易，比如说售卖一间房子或一笔生意。

The $2.5 billion deal was the largest office transaction in Singapore’s history.

这笔 25 亿美元的交易是新加坡历史上最大的办公楼交易。

The central bank has been addressing the issue by facilitating foreign visitors' bank card payments in large transactions, promoting their mobile payment via QR codes in small amounts, and guaranteeing cash payment as the last resort.

央行一直在致力于这一问题的解决，为外国游客大额交易银行卡支付提供便利，推广二维码小额移动支付，并保障现金支付作为最后手段。