1. Sea urchins live on rocky ocean floors.
海胆生活在多岩石的海底。

2. Scientists study urchins to understand marine ecosystems.
科学家研究海胆以了解海洋生态系统。

3. The beach was covered with urchins after the tide.
退潮后海滩上布满了海胆。

4. Street urchins played in the narrow alley.
街头的流浪孩子在狭窄的巷子里玩耍。

A: Did you see the sea urchins while diving?
A：你潜水时看到海胆了吗？

B: Yes, they were attached to the rocks underwater.
B：是的，它们附着在水下的岩石上。

1) 海洋中的刺状棘皮动物（海胆）

2) 生活在街头的贫困儿童（文学或旧用法）

3) 用于比喻顽皮或流浪的孩子

4) 生物学中对海胆类群的统称

1. 海胆；（旧称）流浪儿

e.g. Sea urchins are common in coastal waters.
海胆在沿海水域很常见。

2. 街头流浪儿童

e.g. The novel describes poor street urchins in the city.
小说描写了城市中贫困的流浪儿童。

noun

1. Plural of urchin; refers to marine animals with spiny shells or, in older usage, homeless children.

Synonym: sea urchins, street children