In the experiment of simulating electrostatic field in the fieldofconstant electric current contact voltage between electrode and conduction paper is often neglected.
在用稳恒电流场模拟静电场的实验中，人们通常忽略了电极与导电纸之间的接触压降。
2
The second piece of luck is that all over the Earth there is a constant vertical electrical field.
第二个比较幸运的地方是，遍布全世界的范围内都有一个恒定的垂直磁场。
3
Embedded statements are not allowed in constant expressions, such as the value of an enumeration constant, the width of a bit-field, or the initial value of a static variable.