许多生物细胞发出的电流都是极微小的，小到要用灵敏仪器才能记录和测量。
The electric currents generated by most living cells are extremely small – often so small that sensitive instruments are needed to record them.
这架仪器很灵敏。
而现在我们具备这样的技术，如果科学家知道在哪能观测到的话，引力波将被灵敏的仪器探测到。
But now we have the technology, and these gravitational waves should be detectable with very sensitive instruments — if scientists had a good idea where to look.
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