当它是曲线的时候，其弯曲的法则看起来至少是一阶至多是二阶。
When it is curved, the law of its curvature seems to be at the least of the first and at the most of the second order.
第二个集合 [A-Za-z0-9_]{2,9} 表示由至少 2 个至多 9 个任意字母、数字和划线组成的序列。
The second set, [A-Za-z0-9_]{2,9}, represents a series of at least two and up to nine of any letter, any digit, and the underscore.
如果客人没有特殊要求，一名服务员必须为客人至少4次、至多6次的热毛巾。
A waiter is required to change a customer's hot towel no less than four times and no more than six times (if the customer has no special requirements).
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