他不得不请一天假因为背疼。的翻译：He had to take a day off because of back pain. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

He had a day off because of back pain.

He had to take a day off because of back pain.

He can not but please a day vacation because the back hurt.

He was obliged to request a day off because backache.

He had to take a day off because of back pain.