后面不加介詞。

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(fèi)力地倒時(shí)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(jīng)常去國外出差。