总公司有急事。
Where are you going?
（你要去哪儿？）
I have urgent business at the head office.
（总公司有急事。）
urgent “紧急的”。head office “总公司”。
I have something urgent to handle at the head office.
handle “处理（工作）”。
I have urgent business to deal with at the head office.
deal with “处理”。
我得去趟大阪， 当天就回来。
I have to make a day trip to Osaka.
（我得去趟大阪， 当天就回来。）
You’d better leave early in the morning.
（那你最好一早出发。）
day trip “当天返回的旅行”。had better “最好”。
I have to go to Osaka and back in a day.
I have to get to and from Osaka in a day.
我下周要出差去X公司。
What are your plans for next week?
（你下周计划做什么？）
I’m visiting X Company next week.
（我下周要出差去X公司。）
visit有“拜访”、 “视察”等意思， 在商业领域它也表示“出差”。
I’m scheduled to visit X Company next week.
I’m going to visit X Company next week.
我下周还得出差。
