extra fee额外费用extraadj.额外的n.额外之物；临时演员adv.特别地Extracellular Polymers Substances胞外聚合物extra-high-leaded brass alloy超高铅黄铜合金extracurricular physical exercise课外体育锻炼extracapillary glomerulonephritis毛细血管外肾小球肾炎extradossed cable-stayed bridge矮塔斜拉桥extraterrestrial life exploration地外生命探索Extra Smooth Sun Protection Cream艳阳夏娇嫩防晒露extracellular polymericsubstances胞外聚合物Extracorpuscular hemolytic anemia细胞外溶血性贫血extracellular polymeric substance胞外聚合物

1. The drive cannot find the sector requested.
   驱动器找不到请求的扇区。
2. Your computer is infected with a boot sector virus.
   您的计算机感染了启动扇区病毒。