請翻譯下面的詞組：

　　1) 十個學(xué)生 ten students

　　數(shù)十個學(xué)生 tens of students

　　2) 五百年 five hundred years

　　數(shù)百年 hundreds of years

　　3) 兩千年 two thousand years

　　數(shù)千年 thousands of years

　　4) 三百萬美元 three million dollars

　　數(shù)百萬美元 millions of dollars

　　5. Language learning is different from other kinds of learning.

　　句中be different from 意為“與…不同”，如：My opinion is different from yours.(我的觀點與你的觀點不同。)

　　請注意下面三個句子中所用的詞組：

　　Man is different from all the other animals in his ability to learn and use a language.

　　Man differs from all the other animals in his ability to learn and use a language.

　　The greatest difference between man and all the other animals is his ability to learn and use a language.

　　從上面的句子中可以看出differ是動詞，different 是形容詞，difference是名詞。

　　6. … find it difficult to succeed in language learning.

　　… find it difficult to succeed in other fields.

　　句中的it是形式賓語(formal object)，真正的賓語(real object)是不定式to succeed in language learning，此類用法在英語中很常見，請注意掌握。如：At first I found it difficult to remember all these new words.(開始我感到記住這些單詞很難。)