"We've always known that the Earth's magnetic field is variable, constantly evolving in time," Raymond said.
“众所周知地球的磁场是变化的，无时无刻不在变化”雷蒙德教授说。
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The second field, of type StaticLocalInitFlag, assists in initializing the variable I correctly the first time the method executes on each instance of class Foo.
In order to accurately calculate casting temperature field, a method of simple variabletime step is established which can ensure the precision of casting temperature field and the speed of calculate.