英語翻譯：

develop; open up; rubbings

例句：

1. 在〔美國〕西部拓荒時代的早期，＂redeye＂是在大部份的酒廊就有的非常普遍的酒。喝了過多就使眼睛充血了。
   In the early days, on the western frontier, red eye was the common alcoholic drink found in most saloons. Over-consumption made the eyes red!
2. 如果我們把才能和資源匯合起來，就能把太空這個尚未開拓的疆域變成一個新的和平疆域。
   By pooling our talents and resources we can make space a new frontier of peace.
3. 頭幾年里，殖民地開拓者覺得生活艱難。
   In the first few year, the colonizer find life difficult.