The claws of a crab are used for grasping things,especially food.

螃蟹用钳抓东西,特别食物。

" Water flees fleas" are not insects but copepods, a crustation crustacean like lubster lobsters and crubs crabs but extremely small.

水蚤不昆虫类而桡脚类动物，像龙虾或螃蟹那样有甲壳，非常小。

Depth and particle size were primary and secondary environment variables that influence the community structure of brachyuran crabs in the present geographic region.

深度与沙径大小，分别为影区域内螃蟹群聚结构之主要与次要因素。