Pre
abbr. 炼油工程师（Petroleum Refining Engineer）
🗣️ 情景例句
Well, it's hard work.
嗯 这种工作很辛苦。
Which one is more difficult?
哪一个是比较难的？
Meanwhile, a microphone, which was lowered into the mine two hours ago, has enabled the men to keep in touch with their closest relatives.
与此同时，两个小时以前放下井去的一只麦克风使井下的人可以与其亲属保持联系。