It's so hard to know 要了解你心中的感受
Without more research, it's hard to know.
我们无从知晓,除非进行更多的研究。
In that case, it's hard to know what to do.
这样就很难知道该怎么做。
It's hard to know what he's really thinking.
很难知道他真正在想什么。
"So you know in Afghanistan it's really hard to compare the good guys from the bad guys."
VOA: standard.2010.07.27
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
They just say, "It's just because!" It's hard to know exactly why it's "a".
他们只会说“没有为什么!”为什么用“a”很难确切搞清楚。
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