仪式太长了，孩子们很难一直安静坐着。
It was difficult for the children to sit still during the long ceremony.
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difficult英 /ˈdɪfɪkəlt/|美 /ˈdɪfɪkəlt/
解释
"it was + difficult + for + 某人 + to + 做某事" 结构，表示对某人来说做某事是困难的。it 是形式主语，真正的主语是 for...to... 不定式短语。
It was difficult for the children to sit still during the long ceremony.
"it was + difficult + for + 某人 + to + 做某事" 结构，表示对某人来说做某事是困难的。it 是形式主语，真正的主语是 for...to... 不定式短语。