depth/depθ/

n. the distance from the top to the bottom of sth or from the front to the back of sth

n. [U; C] 深，深度：the depth of a river/cupboard 河/橱柜的深度

◇[a depth of sth] They dived to a depth of 50 metres. 他们潜到50米深的地方。

◇The fish is found at a depth of 1,000 metres in the sea. 这种鱼可见于1,000米深海处。

构词deep的名词

巧记 加th构成的名词有：

breathe → breath

long → length

wide → width