小于的用法和样例：
例句
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一年级新生小于十八岁或大于十九岁是相当特殊的。
It is quite unusual for a freshman to be younger than eighteen or older than nineteen. -
负数的有关或表示一个小于零的数的
Relating to or designating a quantity less than zero. -
2号铁头球棒铁制高尔夫球棒，其高击斜面大于发球球棒小于3号铁头球棒，用于击中远球和长距离球；2号铁头球棒
An iron golf club that has more loft than a driver and less than a three iron, used for medium fairway shots and long approach shots; a two iron.
