The example in Listing 2 sums odd Numbers by returning the sum of both Numbers only if the second number is odd, otherwise returning only the first number.
清单2中的示例对奇数进行合计，如果第二个数是奇数，会返回两个数的总和，否则只返回第一个数字。
2
It's just like if you restrict me to only a subset of Numbers, only the odd Numbers, still there's an infinity of odd Numbers.
这就像，如果你把我限制在数字的子集，只是奇数，但奇数的数量却仍然是无限多的。
3
My parents thought it was odd, but because I didn't have any siblings for them to compare me with, they didn't realise just how odd.