這種子彈能讓美國狙擊手變得無敵嗎?
The US military has successfully tested a .50-caliber sniper round that can change direction on its way to its target.
美軍成功測試了一款50口徑的狙擊子彈，在向目標發射的過程中可改變方向。And now the Defense Advanced Research Projects Agency (Darpa) has released a video of this Extreme Accuracy Tasked Ordnance (Exacto) program in action.
美國國防先進研究項目局公佈了這個“高精度目標武器”項目的視頻。
The footage shows the bullet changing direction in mid-air in response to a target's movements.
視頻中，子彈可根據目標物體的移動而在半空中改變方向。
According to Darpa: 'For military snipers, acquiring moving targets in unfavourable conditions, such as high winds and dusty terrain commonly found in Afghanistan, is extremely challenging with current technology.
根據美國國防先進研究項目局的說法：“對於狙擊手來說，在目前的技術條件下，要想在不利的環境中瞄準移動的目標是非常不容易的，比如在阿富汗這種風大塵土飛揚的環境下。”
'It is critical that snipers be able to engage targets faster, and with better accuracy, since any shot that doesn't hit a target also risks the safety of troops by indicating their presence and potentially exposing their location.'
“讓狙擊手更快更精準的鎖定目標是非常重要的，因爲如果沒有狙擊中的話，就會暴露狙擊手，從而對軍隊的安全構成威脅。”Darpa claims the new system is the first ever guided small caliber bullet.
美國國防先進研究項目局稱這個新系統是首款制導的小型口徑子彈。'The Exacto .50-caliber round and optical sighting technology expects to greatly extend the day and night time range overcurrent state-of-the-art sniper systems,' continued the agency.
“這款叫做Exacto的50口徑光學瞄準技術將大大的擴展目前最先進狙擊系統的作戰時間跨度。”
'The system combines a manoeuverable bullet and a real-time guidance system to track and deliver the projectile to the target, allowing the bullet to change path during flight to compensate for any unexpected factors that may drive it off course.
“這套系統將一種機動的子彈同一款實時的制導系統組合在一起，從而追蹤目標併發起攻擊，並且可在空中根據情況來調整飛行方向。”'Technology development in Phase II included the design, integration and demonstration of aero-actuation controls,power sources, optical guidance systems, and sensors.
“第二階段的技術研發包括了航空刺激系統的設計、整合和演示，以及動力來源，光學導航系統和傳感器。”'The program's next phase includes asystem-level live-fire test and technology refinement to enhance and improveper formance.'
“這個項目的下一個階段將包括系統水平的實彈測試和技術方面的精細化，從而加強和提高性能。“The current world record for the longest certified kill was by Corporal Craig Harrison of the UKHousehold Cavalry, who killed two Taliban in November 2009 from 1.54 miles (22.4km).
目前世界最長距離的狙擊記錄保持者是來自英國皇室衛隊的下士Craig Harrison，他在2009年11月份擊斃了22.4公里外的兩名塔利班成員。The shot was approximately 3,000ft (914 metres) beyond the stated maximum range of the Accuracy L115A3 sniper rifle, used by Corporal Harrison.
這個距離比這個下士所使用的L115A3狙擊步槍的最大射程還要多出914米。
The Taliban were so far away it took each round almost three seconds to reach its target.
這兩名塔利班成員離得那麼遠，以至於每一槍都要歷時3秒鐘才擊中了目標。
