螃蟹

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

用钳抓东西,特别是食物。

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

水蚤不是昆虫类而是桡脚类的动物，像龙虾或有甲壳的，但是非常小的。

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，分别为影响调查区域内聚结构之主要与次要因素。