13 篇文章
and head down to the bottom of the gorge.
19 0 1

and head down to the bottom of the gorge. 奔向峡谷底部

to the bottom of this pit.
19 0 1

to the bottom of this pit. 直达这个深渊的底部

400 metres to the bottom,
19 0 0

400 metres to the bottom, 深达400多米