当Seb在海上时，他使用特殊的电话。的翻译：When Seb is at sea, he uses special phone. 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

When seb at sea, he uses a special telephone.

When Seb is at sea, he uses special phone.

When Seb when marine, he uses the special telephone.

When he was at sea, Seb using special telephone.

When Seb is at sea, he uses special phone.