新概念英语是一套非常受欢迎的英语教材系列，共分为4个级别。随着学习者逐渐进阶，每个级别的单词量也会逐渐增加。下面我们来具体了解一下每个级别的单词数量。

第一级别（New Concept English Book One）是初级入门级别的课程。该级别主要注重基础单词和简单的语法知识的学习。据统计，第一级别的新概念英语大约包含800-900个单词。

第二级别（New Concept English Book Two）相对于第一级别来说，涉及到更多的语法和词汇。第二级别的新概念英语大约包含1000-1100个单词。

第三级别（New Concept English Book Three）是进阶级别的课程。在这个级别中，学习者将学习更复杂的语法结构和更多的词汇。据统计，第三级别的新概念英语大约包含1200-1300个单词。

第四级别（New Concept English Book Four）是最高级别的课程，也是最具挑战性的课程。学习者将进一步拓展他们的词汇量和语法知识。第四级别的新概念英语大约包含1400-1500个单词。

这些数字仅供参考，实际上每个人的学习进度可能不尽相同。有些人可能需要更多时间来学习和掌握这些单词，而其他人可能能够更快地掌握它们。因此，理解这些数字只是一个参考，最重要的是根据自己的学习能力和进度来制定学习计划。

总之，新概念英语各级的单词数量逐级增加，在学习过程中，我们可以根据自己的实际情况来制定学习计划，逐步提升自己的词汇量和语法水平。

English Translation:

New Concept English is a popular series of English textbooks, divided into 4 levels. As learners progress, the number of words in each level also increases. Now, let's take a closer look at the word count for each level.

Level One (New Concept English Book One) is an introductory level course. It focuses on basic vocabulary and simple grammar knowledge. According to statistics, Level One of New Concept English consists of approximately 800-900 words.

Level Two (New Concept English Book Two) covers more grammar and vocabulary compared to Level One. Level Two of New Concept English consists of approximately 1000-1100 words.

Level Three (New Concept English Book Three) is an advanced level course. In this level, learners will learn more complex grammar structures and a wider range of vocabulary. According to statistics, Level Three of New Concept English consists of approximately 1200-1300 words.

Level Four (New Concept English Book Four) is the highest level and the most challenging course. Learners will further expand their vocabulary and grammar knowledge in this level. Level Four of New Concept English consists of approximately 1400-1500 words.

These numbers are for reference only, as individual learning progress may vary. Some people may need more time to learn and master these words, while others may be able to grasp them more quickly. Therefore, understanding these numbers is just a reference point, and it is crucial to devise a learning plan based on our own learning abilities and pace.

In conclusion, the number of words in each level of New Concept English increases progressively. During the learning process, we can develop our own learning plan based on our specific circumstances, gradually enhancing our vocabulary and grammar proficiency.