Every spring the Amazon dolphins get to leave the confines of their river channel for a taste of their former habitat.
每年春天，亚马逊河豚离开所属河道的范围，到从前的栖地去晃一晃。
2
Because the water pressure in spring assembly and valve body makes the conical compression core and seat seal automatically, the flow channel of valve is closed.
因弹簧总成和阀体中水流压力将锥形压芯和锥形压座自动压合密封，阀体水流通道关闭。
3
The vent valve comprises an air vent screw, a spring and a valve ball which leans against the channel under the acting force of the spring.