So how do we approach those difficult problems?
因此，我们如何着手处理这些困难问题呢？
If so, how difficult will they be to acquire?
如果可以的话，获得这些链接的难度有多大？
The custom began so long ago, it is difficult to know how it got started.
这项风俗由于起源很早，所以很难知道它最初是怎样开始的。
I can't imagine how difficult this is for them... to lose someone so special.
我无法想象有多么困难，这是他们…失去某人如此特别。
But now I learn how so hard? Is really easy to learn but difficult to look it!
可如今我学起来怎么这么费力呢？真是看起来容易学起来难啊！
Since it's so difficult, why is it so important to learn how to spell properly?
既然这么难，为什么学会准确拼音又如此重要呢？
Because the space is so great, it is difficult to work out how far away a star is.
因为天空太大了，所以很难计算出一颗恒星有多远。
Because the space is so great, it is difficult to work out how far away a star is.
因为天空太大了，所以很难计算出一颗恒星有多远。
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