Karst
n. 喀斯特(區)
??? 情景例句
she's still alone, without her family.
她仍是孤單單的，找不到家。
To plan a mountain climbing expedition.
計劃登山探險。
This is done by a great number of ring-shaped air jets on the bottom of the craft.
船底裝上大量環狀噴氣嘴以實現這一目的。