That's a billion dollar question or least will become one by the time we even have a good working prototype.

这是个数十亿美元的问题，或至少我们届时将有一个能够很好工作的原型。

youdao

Now, don't ask me what's the cost and time overrun in LCA. That's another billion-dollar question.

现在不要问我LCA的费用和时间超出预算，那是另一个数十亿美元的问题。

youdao

Now, don't ask me what's the cost and time overrun in LCA. That's another billion-dollar question.

现在不要问我LCA的费用和时间超出预算，那是另一个数十亿美元的问题。

youdao