A compass needle points north.
罗盘指针指向北方。
You're as true as a compass needle, pointing to your goal no matter what happens.
你就象一个指南针，风雨无阻地指向你的目标。
A compass needle points to the north.
罗盘的指针永远指向北方。
To get to the North Pole, or true north, just following your compass needle won't work.
想去北极，或者是要找到正北向，单纯依靠指南针是不会奏效的。
While the magnetic field surrounding a current-carrying wire is indeed interesting, it is quite weak for common amounts of current, able to deflect a compass needle and not much more.
当磁场围绕着带电导线时会有很有趣的现象发生，通常所用的电流产生的磁场相当的弱，最多可以使指南针的指针发生偏转。
While the magnetic field surrounding a current-carrying wire is indeed interesting, it is quite weak for common amounts of current, able to deflect a compass needle and not much more.
当磁场围绕着带电导线时会有很有趣的现象发生，通常所用的电流产生的磁场相当的弱，最多可以使指南针的指针发生偏转。
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