後面不加介詞。
去國外,出國
We can't afford to go abroad this summer.
今年夏天我們沒有足夠的錢去國外。
Every time I go abroad, I have to struggle with jet lag.
我每次出國都要費力地倒時差。
We always go abroad in the summer.
我們總是在夏天去國外。
He often has to go abroad for work.
他經常去國外出差。