They had only a vague idea where the place was.

他们只是大概知道那个地方的位置。

《牛津词典》

They have only a vague idea of the amount of water available.

他们对于可用水量只有一点模糊的了解。

《柯林斯英汉双解大词典》

Such programs are much needed because in many arid lands there is only a vague idea of the extent of groundwater resources.

这样的计划是非常必要的，因为在许多干旱地区，我们并不清楚其地下水资源的范围。

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"I had a vague idea that there was a connection but nothing definite, " he said.

BBC: London man 'amazed' to learn of Abraham Lincoln connection

First of all, companies should have at least a vague idea of how the data may be of value before spending money to store it.

FORBES: Curing the Big Data Storage Fetish

Once young salmon get to the ocean, scientists have only a vague idea where they go, and an incomplete understanding of why some years they thrive and some years they starve.

MSN: Record numbers of sockeye salmon return to Northwest - US news - Environment | NBC News