current generator

例句：

1. 1.The current is strong enough to carry a boat.
   水流足够强大，可以承载一艘小船。
2. 2. The current of the river flows through the town.
   河流的水流穿过这个城镇。
3. 3.He was in the current of the crowd.
   他正处在人群之中。