dual-purpose的用法和样例：
词汇搭配
- dual purpose tire 公路越野两用轮胎...
- dual-purpose oil 双效油
- dual purpose receiver 模拟和数字两用接收机...
- dual-purpose additive 双效添加剂
- dual-purpose reactor 两用反应堆
- dual purpose card 双用卡片
- dual-purpose breed 兼用种
- dual-purpose column 两用柱
- dual purpose 双重目的(双效的...
