The explanation may be in Earth's mantle, the layer of rock underlying the tectonic plates and extending down over 1,800 miles to the outer edge of Earth's iron core.
解释可能是在地球的地幔中，这是在构造板块下面的岩石层，向下延伸超过1800英里到地球铁芯的外边缘。
2
This arrangement makes it possible to bubble the exhaust gas down through the outer compartment and then bubble it back up through the opaque middle.
这种安排使得它可以导引废气穿过外隔层，然后再导引其经由中间的不透明管道返回。
3
Then, solemnly, the group walked down an outdoor,semi-covered wooden corridor and up a short flight of steps, onto the platformof a large outer shrine.