Half the fun of gardening is never knowing exactly what's going to come up.

园艺的最大乐趣是谁也不知道到底会长出什么。

《牛津词典》

Never knowing where you're going.

从不知道你往哪里去。

youdao

It was no way to live never knowing when one of these storms would break.

这样的日子可怎么熬？总是担惊受怕，不知道什么时候这样的暴风雨又会袭来。

youdao

She hates never knowing when a real estate agent might call wanting to bring a prospective buyer to see the house.

NPR: Subprime Crisis Makes It Maddening to Sell a House

In the past, Moretti, a veteran of three other entrepreneurial ventures, would raise one large venture round, never knowing when hed need capital.

FORBES: Going Into Hock

In the classic tradition of never knowing when too much was just that, the Maserati brothers always had a slight problem with racing: They were addicted to it.

FORBES: Vehicles Feature