没有预料到困难
The difficulty was not anticipated
以上为机器翻译结果，长、整句建议使用 人工翻译 。
事实：一般情况代码设计的延误是由于未预料到的困难或者没有按照最开始的设计工作。
Reality: Typically, coding delays occur because of unexpected difficulties or because the original design just didn't work.
youdao
我们没有预料到机器投入生产前会遇到意外困难。
We didn't expect to hit a snag before the machine was ready for production.
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