Longer sentences and an expanded vocabulary make this series of 48-page books slightly more challenging: Level 2 is appropriate for children who have started to read but still need help.

长句子和扩大词汇量使这一长达48页的稍微更有挑战性的系列丛书：2级是谁开始阅读，但儿童仍然需要适当的帮助。

youdao

As Helen's knowledge and vocabulary expanded, she asked more and more questions.

随着海伦知识和词汇的增加，她问的问题越来越多了。

youdao

Through consciously massive reading, on the one hand expanded the vocabulary, on the other hand has raised the language sense.

通过有意识的大量阅读，一方面扩大了词汇量，另一方面培养了语感。

youdao

Also, after hardly budging in the first half of the 20th century, the English vocabulary expanded at a rate of 8, 500 words a year in the second half, leading to a 70% increase in its size since 1950 (see chart).

ECONOMIST: Science invades the humanities