Cross-border describes something that happens across the line between two countries — money, people, trade, crime, phone calls, pollution — anything that starts on one side and ends up on the other. It sits in front of a noun almost all the time: cross-border trade, cross-border payments, cross-border crime, a cross-border attack.

Cross-border describes形容 across the line between two countries跨過兩國之間那條線 happens發生的 something事——money錢、people人、trade貿易、crime犯罪、phone calls電話、pollution污染——starts on one side從一邊開始 and ends up on the other、落在另一邊的 anything任何東西。It它 almost all the time幾乎總是 sits in front of a noun放在名詞前面：cross-border trade跨境貿易、cross-border payments跨境支付、cross-border crime跨境犯罪、a cross-border attack一場跨境攻擊

You will meet it most in news and business writing; it is a slightly formal word, and nobody says it about their own weekend trip. If you drove to another country to buy cheap milk, you would say "I went across the border", not "I made a cross-border journey" — though a newspaper writing about a thousand people doing the same thing would call it cross-border shopping. That is the pattern: it likes big, repeated, official-sounding movement more than one person's day out.

You你 in news and business writing在新聞和財經文章裡 will meet it most最常遇到它；it它 is是 a slightly formal word稍微正式的詞，and nobody沒有人 about their own weekend trip講自己的週末小旅行時 says it會用它。If如果 you你 drove to another country開車到另一個國家 to buy cheap milk去買便宜的牛奶，you would say你會說 "I went across the border"「我過了邊界」，not不會說 "I made a cross-border journey"「我進行了一趟跨境旅程」——though不過 a newspaper一份報紙 writing about寫到 a thousand people一千個人 doing the same thing做同一件事時，would call it會把它叫作 cross-border shopping跨境購物。That is the pattern模式就是這樣：it它 than one person's day out比起一個人的出遊 likes更喜歡 big, repeated, official-sounding movement大規模、反覆、聽起來官方的移動

It can also work as an adverb, as in "the goods move cross-border without tax", but that use is rarer and belongs mostly to trade and banking writing; in ordinary sentences people say "across the border" instead.

It它 can also work as an adverb也能當副詞用，as in像 "the goods move cross-border without tax"「貨物免稅跨境移動」，but但 that use那種用法 is rarer比較少見，and belongs mostly to多半屬於 trade and banking writing貿易和銀行的文章；in ordinary sentences在一般的句子裡 people人們 instead改 say "across the border"說 "across the border"

One more thing worth noticing: "border" here is a national border. Talking about two counties or two cities inside one country, English usually says something else.

One more thing worth noticing還有一件值得注意的事：here這裡 "border"的 "border" is a national border是國界。Talking about講到 inside one country同一個國家裡 two counties or two cities的兩個縣或兩座城市時，English英語 usually通常 says something else用別的說法