Because of the selectivity of fishing gear and mixed distribution of fish species, there will be inevitably by-catches and discards when people catch the target species.
由于渔具不同的选择性和多鱼种鱼类共栖，人们在对目标种类进行捕捞时，不可避免地产生副渔获物及其抛弃。
2
The little boy always catches dragonflies by the river in summer.
夏天，这个小男孩总是在河边抓蜻蜓。
3
Now developer 1 catches up the change of FILEA by developer 2, modifies it and again releases to the stream.