That sounds a silly suggestion, but that was precisely the idea adopted in some of the early instruments (seismometers) for recording earthquake waves.

这听起来似乎是一种愚蠢的想法，但是早期记录地震波的仪器（地震仪）正是采用了这种思路。

So scientists have had to resort to indirect ways of studying the core, like measuring earthquake waves that pass through it, or studying minerals thought to have formed there.

因此， 科学家们不得不求助于研究地核的间接方法，例如测量穿过地核的地震波，或研究被认为在那里形成的矿物。