Tracing satellite images back over the past few decades can start to unravel part of the mystery.

追踪过去几十年的卫星图像可以解开部分谜团。

Since the new resurgence emerged on Monday, the city has traced over 430 close contacts and asymptomatic cases.

自周一出现新病例以来，该市已追踪到430多名密切接触者和无症状病例。

And so we can actually start to trace people over time.

所以我们实际上可以开始随着时间的推移追踪人们。

As he traced his fingers over the surface, he found a tiny hidden latch.

当他用手指在表面上摸索时，他发现了一个隐藏的小闩锁。

Geologists can trace the position of continents over time by measuring changes in Earth's magnetic field.

地质学家可以通过测量地球磁场的变化来追踪大陆随时间的位置。

Our journey towards commercial aviation as we know it today can be traced back over 530 years.

我们今天所知的商业航空之旅可以追溯到 530 多年前。

I traced over 112 frames from a video of a beautiful, fancy shawl dancer named Danielle Bear, and this is how it looked.

我从一个名叫 Danielle Bear 的美丽、奇特的披肩舞者的视频中追踪了超过 112 帧，这就是它的样子。

I traced the paths of the ancient glaciers over many a shining pavement, and marked the gaps in the upper forests that told the power of the winter avalanches.

我在许多闪亮的人行道上追踪古老冰川的路径，并在上层森林中标出表明冬季雪崩威力的缝隙。

When at last he stopped outside our door, I could hear his finger tracing over the painted letters of my name, and I afterwards distinctly heard him breathing in at the keyhole.

当他终于停在我们的门外时，我能听到他的手指抚摸着我名字的彩绘字母，然后我清楚地听到他在钥匙孔里呼吸。