kilometer是什么意思？

The fulmars travel some 400 kilometers over the sea to find food.

More than paradise lost, a perishing rain forest could trigger a domino effect - sending winds and rains kilometers off course and loading the skies with even greater levels of greenhouse gases - that will be felt far beyond the Amazon basin.

As part of the upgrading of its rail yard, Kasselman, who is an inventor and self-proclaimed "steam visionary", is campaigning for a new steam train that runs without any fire and could run on an existing ten- kilometer line, driving tourists and perhaps