恢复生产的精确时间表与速度仍然是一个不确定的来源。

The precise timing and pace of production recovery remains a source of uncertainty.

youdao

目的：寻找出口调味粉中菌落总数测量不确定的来源并进行评定。

Objective: The study is designed to find the source of measurement uncertainty to be evaluated in exported seasoning powder.

youdao

这种化石的肺鱼是新的物种，但因为它不确定的来源导致至今无法命名。

The fossil lungfish is a new species, but a name cannot be given because of its uncertain origin.

youdao

I don't see how I can earn income next year, but in principle, that's what Irving Fisher said.

而且我不确定明年的收入来源,这也是欧文·费雪理论的一部分

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