你需要一名律师才能理解这份合同中复杂的法律用语。

You need a lawyer to understand the complex ___language of this contract.

在国际贸易中，英语通常被认为是必不可少的商业用语。

In international trade, English is often considered the essential ___language of business.

英语已成为科学领域的主导语言，尽管一些学术论文可能难以理解。

English has become the dominant ___language of science, even though some academic papers can be difficult to comprehend.