1. When it really opens, probably in October, the 31-mile Channel Tunnel (the Chunnel, for short) will be 15 months behind schedule and $7 billion over a budget set in 1987.
    当隧道正式开放时(可能是在10月)，这条长31英里的英吉利海峡隧道（以下简称隧道）的开通将比预期推迟15个月，耗资将比1987年的预算多出70亿美元。

2. This gave five 31-day months and seven 30-day months.
    这种方法划分出了五个有31天的月份和七个有30天的月份。

3. The Romans thought that odd numbers were lucky and they took a day from a 30-day month — from February — to get an extra 31-day month.
    罗马人认为奇数是吉祥的数字，他们从一个有30天的月份——2月份——中去掉了一天，从而又多了一个有31天的月份。

4. This month, of course, was given 31 days.
    当然，这个月份也是有31天的月份，

5. There were now seven 31-day months in a year, but February was left with 28 days except in leap years.
    现在一年中就有了七个有31天的月份，但是2月份除了闰年就只剩下了28天。

6. On January 30, 1948, a British airliner vanished over the triangle with 31 passengers and crew aboard.
    1948年1月30日，一架英国飞机消失在该三角地带上空，机上有31名乘客和机组人员。