Home... hard to know what it is if you've never had one.

家…如果你不曾有过也就无法了解。

youdao

But, even so, it is hard to know what they want instead.

但是，即使这样，我们还是很难了解他们想要什么。

youdao

It is hard for firms to know what the "right" prices are in two-sided markets.

对公司来说知道双边市场中“正确”的价格是很难的。

youdao

It's hard to know again what the melody is or what the phrase is here.

还是很难听出,这里面的旋律或者乐句

耶鲁公开课 - 聆听音乐课程节选

Little is being discussed in the press so it is hard to know what is going on behind the scenes.

FORBES: Will The U.S.Allow Foreign Ownership Of A Giant Swath Of Our Broadband Spectrum?

It is hard to know what is true and what is rumor, but I do know that my classmates lived under fear and inhumane pressure, and that it was not right.

FORBES: Magazine Article

It is hard to know exactly what Sistani is thinking and planning.

NPR: Sectarian Violence Erodes Sistani's Influence in Iraq