把包折叠起来时，其底部与一边就重合了。

When the bag is folded, the bottom overlaps one side.

《柯林斯英汉双解大词典》

冰川的向前移动，其底部与海洋接触处的融化，还有波浪和潮汐运动，导致冰块断裂，漂浮到海上。

The forward movement, the melting at the base of the glacier where it meets the ocean, and waves and tidal action cause blocks of ice to break off and float out to sea.

youdao

赫拉斯盆地是古老火星海洋位置的另一个候选地点，据测量，其跨度大约为3000公里，并且其底部位于盆地边缘下方接近9公里的位置。

The Hellas Basin, which measures some 3,000 kilometers across and has a floor that lies nearly 9 kilometers below the basin's rim, is another candidate for an ancient Martian sea.

youdao

It's a helpful little story to remember, because we tend to think of Greece because of its modern geography as that peninsula of which there is a sub peninsula at the bottom, which is Peloponnesus.

这是个很生动的比喻,因为我们都认为现代希腊的,地理环境,在其底部是,一个分离于大陆的半岛,即伯罗奔尼撒半岛

耶鲁公开课 - 古希腊历史简介课程节选