For Britons, who are wont to label any temperature the wrong side of zero "Siberian", the difference between cold and even colder might seem intangible.
对英国人来说，他们不会把零下的温度挂上“西伯利亚”的标签，冷和更冷的区别似乎界线不是很清楚。
2
Listing 6 (eg3.xml) is an Examplotron schema that specifies zero, one, or more label elements, and allows a single, optional quote element.