I found the lecture hard to follow because it had started when I arrived.
我发现这个演讲很难听懂，因为我到这儿的时候，演讲就已经开始了。
They found the lecture hard to understand.
他们发现这报告不好懂。
They found Professor Jones' lecture hard to understand.
他们发现琼斯教授的讲座很难懂。
I found it hard to follow his lecture.
我觉得他的讲座很难听懂。
I tried hard not to lose a word of his lecture.
我们不应该灰心，我们可以再试一次。
I tried hard not to lose a word of his lecture.
我们不应该灰心，我们可以再试一次。
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