A practicable transistor on-offcircuit is presented which can measure capacitance and dielectric constant accurately.
介绍一个实用的晶体管开关电路，用它能够较准确地测定电容和介电常量。
2
Gates doesn't travel much on the Beltway's social circuit, instead spending off-hours with his wife and a small cadre of aides.
盖茨与华盛顿周围的社交圈子并没有太多的来往，业余时间倒是与妻子和一些骨干小助手呆在一起。
3
In theory, this could one day provide a key component of any nanoscale electrical circuit-a way to mechanically turn the current on and off or change its direction.