To measure them properly，monitoring equipment would have to be laid out on a grid at intervals of at most 50 kilometers，with se ors at each grid point lowered deep in the ocean and kept there for many months.
To measure them properly，monitoring equipment would have to be laid out on a grid at intervals of at most 50 kilometers，with se ors at each grid point lowered deep in the ocean and kept there for many months.
为了恰当地测量它们，监测设备必须被设置在一网络上，彼此的间距最多为五十公里，位于每个网点的感应器沉放至海洋深处，并在许多个月中一直固定在那里。