The -v option prints lines where the specified text is not found.
v选项将输出未找到指定文本的行。
Dopants for silicon wafers are found in Groups III and V of the Periodic Table of the Elements.
晶圆片搀杂剂可以在元素周期表的III和V族元素中发现。
The lamellar cracking was found at the specimen of HSLA Nb-V steel plate after tensile strength testing, then the fracture surface of the specimen was studied by SEM and EDAX.
针对高强度低合金铌钒钢板在拉伸试验后出现分层开裂的现象，采用SEM、EDAX进行微观分析，发现试样内部有大量夹杂物存在，这些夹杂物主要含有钙、氧、硫、锰等元素。
In other new research, a study has found that circumcision does not decrease the risk that H.I.V.positive men will infect women.
VOA: special.2009.07.29
Researchers say they have found a way to extend the storage life of a drug used to treat H.I.V.
VOA: special.2010.05.24
When the war ended, American forces found the parts for about one hundred V-2 rockets.
VOA: special.2009.06.10
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