We have to invent a new method for sneaking prisoners out without the guards noticing.
我们必须想出新的办法使囚犯们偷偷溜出去而不被看守发现。
Therefore, it's an essential task for us to research the principle of abrasive wear, find the reasons of abrasive wear and invent a kind of effectively and economically method.
因此研究磨粒磨损的机理，探索造成机器磨损失效的原因，寻求有效而经济的耐磨材料和抗磨技术是一项刻不容缓的任务。
We have to invent a new method for sneaking prisoners out without being noticed by the guards.
我们必须想出新的办法使囚犯们偷偷溜出去而不被看守发现。
To invent is to make something that had no previous existence, such as a machine or a method, through the use of the imagination or through experiment, or to make up sth .
发明，指发明出某时期以前不存在的新东西或方法等，也可表示“虚构、编造”之意。
To invent is to make something that had no previous existence, such as a machine or a method, through the use of the imagination or through experiment, or to make up sth .
发明，指发明出某时期以前不存在的新东西或方法等，也可表示“虚构、编造”之意。
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