他正在申请签证用英文怎么说

"He is applying for a visa"

来源：这是一个常用的英语表达方式。

英文例句：

"He's in the process of applying for a visa to enter the country."
"She's been busy completing the required documents for her visa apppcation."

中文翻译：

"他正在申请入境国的签证。"
"她一直忙着准备签证申请所需的文件。"