dual-purpose的用法和樣例：
辭彙搭配
- dual purpose tire 公路越野兩用輪胎...
- dual-purpose oil 雙效油
- dual purpose receiver 模擬和數字兩用接收機...
- dual-purpose additive 雙效添加劑
- dual-purpose reactor 兩用反應堆
- dual purpose card 雙用卡片
- dual-purpose breed 兼用種
- dual-purpose column 兩用柱
- dual purpose 雙重目的(雙效的...
