Roa
abbr. received on account 计算标准; Reserve Officer Association <美国>预备役军官协会; return on assets 资产返还; right occiput anterior 前面的右枕骨
🗣️ 情景例句
It seems so simple now.
现在事情显得很简单了。
How did your party turn out last night?
你们昨晚的聚会结果怎么样？
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。