单词central-pit
网络: 央点凹；中央点凹；中心窝
Observation can clearly see the Central pit there was something in particle exists, also known as the "pits" .
观察可明显看到凹坑的中央有异物粒子存在，又称“麻点”。
The central pit in the 55-acre site became a pool of bright green water.
55英亩的场地中央坑变成了亮绿色的水池。