大学英语：It is more important for them to learn

It is more important for them to learn to think in the language than to know the meaning of every word.

　　不定式短语to learn to think in the language是句子的真正主语。it常常被用来代替不定式，在句子中充当形式主语，而把真正的主语移到句子后面去，这样使句子显得比较平稳。为了说明不定式表示的动作是谁做的，便在不定式前加for引起的短语。又如：

　　1) It is not at all difficult for him to understand the poem.

　　2) It is necessary for us to lend him a helping hand at this time.

　　more important than是形容词比较级形式，请翻译下面的句子：

　　1） 汤姆的年龄比玛丽大。（Tom is older than Mary.)

　　2） 这本书比那本书更有趣。（This book is more interesting than that one.)

　　3） 我们班的学生人数比他们班的多。（There are more students in our class than in theirs.)