current pointer

例句：

1. 1. The current is strong enough to carry the boat.
   水流足够强，能托起船。
2. 2.She was in the current of the river when she fell into it.
   她掉进河里时正处在水流中。
3. 3. The current of the ocean is so strong that ships cannot sail against it.
   海洋的水流如此强大，以至于船只无法逆流而上。