Considering the difficulty of gaining the evidence for the defendant's sales amount of the infringed product, the litigant usually chooses to use other ways to prove.

鉴于获取被告销售侵权产品数量的证据有时具有一定难度，当事人往往会选择其他方式进行证明。

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Actually, as long as we can turn difficulty to easy, change a way of thinking, the simple formula also can prove it.

实际上，只要我们能够化繁为简，换个思路，用平面几何的简单公式亦能证明。

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The difficulty was how he could prove his ideas to other scientists.

困难在于他怎样才能向其他科学家证实他的想法。

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Those who have labored to establish his innocence have faced as much difficulty as those who have struggled to prove his guilt.

CNN: Moxley Case: Excerpts from the Sutton Report

In the past, vote-buying has been hard to prove because of the difficulty of obtaining evidence.

ECONOMIST: Thailand

But history shows a pattern: when attractions prove too expensive to maintain, score low on guest approval, lose sponsorship or have difficulty churning through high numbers of visitors, they are likely to meet the wrecking ball.

BBC: Walt Disney World's most endangered attractions