Stefan Maus: They're equipped with very sensitive magnetometers that measure the direction and strength of the magnetic field and that altitude.
斯特芬?茅斯：科学家们采用非常灵敏的磁力计来测量地磁场的方向、强度及方位。
3
"Your father... was supposed to be alone..." Some measure of strength had returned to his voice, but he was still struggling to maintain his composure.