这本词典涵盖了医学领域的主要词汇。

This dictionary covers the core ___lexis of the medical field.

这位教授的学术词汇非常丰富，显示了他深厚的专业知识。

The professor's academic ___lexis is remarkably rich, demonstrating his deep expertise.

这门课程专注于词汇学研究，探讨单词及其含义。

This course focuses on ___lexis, studying words and their meanings.