17.
(A) limited to
(B) in contrast with
(C) on top of
(D) separate from

When the United States first fired a missile from an armed Predator drone in Afghanistan on November 14,2001, it was clear that warfare had forever changed. During the two decades that followed, drones became the most iconic instrument of the war on terror. Highly sophisticated, multimillion-dollar US drones were repeatedly used in targeted killing campaigns. But their use worldwide was limited to powerful nations. Then, as the navigation systems and wireless technologies in hobbyist drones and consumer electronics improved, a second style of military drone appeared—not in Washington, but in Istanbul. And it caught the world’s attention in Ukraine in 2022, when it proved itself capable of holding back one of the toughest militaries on the planet. The Bayraktar TB2 drone, a Turkish-made aircraft from the Baykar corporation, marks a new chapter in the still-new era of drone warfare. Cheap, widely available drones have changed how smaller nations fight modern wars.
2001 年 11 月 14 日，當美國在阿富汗首次從掠奪者無人攻擊機上發射導彈時，
戰爭顯然發生了翻天覆地的變化。在隨後的二十年裡，無人機成為反恐戰爭中最具標誌性的工具。美國耗資數百萬美元研製的高精尖無人機多次被用於定點清除行動。但它們在世界範圍內的使用僅限於強國。後來，隨著業餘無人機和消費電子產品中導航系統和無線技術的改進，第二種軍用無人機出現了--不是在華盛頓，而是在伊斯坦堡。2022 年，這種無人機在烏克蘭引起了世界的關注，當時它證明自己有能力抵擋地球上最強悍的軍隊之一。Bayraktar TB2 無人機是土耳其 Baykar 公司製造的飛機，它標誌著無人機作戰新時代的新篇章。廉價、廣泛可用的無人機改變了小國打現代戰爭的方式。

 But their use worldwide was limited to powerful nations.
但它們在世界範圍內的使用僅限於強國。 

But their use worldwide was limited to powerful nations. 
但它們在全球的使用僅限於強國。limited to 僅限於

in contrast with 與…相比之下