求翻译：在科技英语词汇中，涉及化学和化工领域的词汇数量最大。从事这一专业工作的技术人员在掌握专业英语时，面对的词汇量数以万计，因而使该领域人员在学习专业英语时遇到的困难最大。是什么意思？

In science and technology vocabulary, involving the largest number of the vocabulary in the field of chemistry and chemical industry. And technical personnel engaged in this professional work in the grasp of English, in the face of the vocabulary of tens of thousands, and thus the difficulties encou

In science and technology in English vocabulary, relating to the chemical and petrochemical fields the largest number of words. In the professional work of the technical staff at the professional English vocabulary, in the face of a 10,000 meter, which makes this area Professional staff in the learn

In the technical English glossary, involves chemistry and chemical domain glossary quantity is biggest.Is engaged in this specialized work technical personnel when grasping specialized English, facing the vocabulary thousands, thus causes this domain personnel at the study specialized English time m

In scientific English words, maximum number of words relating to chemistry and chemical areas. Technicians engaged in the professional work on mastering professional English, vocabulary of tens of thousands, so that the field personnel encounter difficulties in learning English the most.