護理師指導學生關於無菌區維持，下列哪一項行為需要被糾正？
A nurse is teaching a student nurse about sterile field maintenance. Which action by the student warrants correction?
- ADropping a sterile item onto the center of the field將無菌物品掉落至無菌區域中央
- BReaching over the sterile field to retrieve an item✓ 正解越過無菌區域撿拾物品
- CKeeping the sterile field in constant view使無菌區域始終保持在視線範圍內
- DPlacing the sterile field at waist level將無菌區域置於腰部高度
無菌技術（Sterile technique）的核心在於維持無菌區（Sterile field）的完整性。任何越過無菌區上方的動作，無論是手臂、衣服或頭髮，皆會增加物體掉落造成污染的風險。無菌區應隨時在視線範圍內，且物品必須從側面拿取，確保無菌區上方空間淨空。這不僅是考試重點，更是臨床防止術後感染（SSI）的重要防禦機制。
The core of sterile technique is maintaining the integrity of the sterile field. Any action that crosses over the sterile field — whether by the arm, clothing, or hair — increases the risk of contamination from falling debris. The sterile field must remain within the line of sight at all times, and items must be retrieved from the side to keep the space above the sterile field clear. This is not only a test focus but also a key defense against postoperative surgical site infection (SSI) in clinical practice.