这种可以每秒钟记录深度和光线的装置被固定在企鹅的背上，以将阻力减到最小。

The devices, which register depth and light every second, were taped to the lower back, so that they caused the least amount of drag.

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这个小标签能记录温度、深度和光强度，并与时间相关，从这些数据我们就能确定位置。

That little tag can record temperature, depth and light intensity, which is correlated with time, and from that we can get locations.

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地质记录显示，在65万年前地球上同一深度的地层，世界各地都有一层薄薄的铱层存在。

At the same 65-million-year depth, the geologic record reveals that a thin layer of iridium was deposited pretty much everywhere in the world.

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