goo-goo

例句：

1. 1. The baby gurgled happily as it was fed.
   宝宝吃奶时发出快乐的咕咕声。
2. 2. The river bubbling over its banks is a beautiful sight.
   河水在河岸上流淌，是一幅美丽的画面。
3. 3. The bubbles popped up from the bottom of the pool, making me laugh.
   从泳池底部冒出的气泡让我忍不住笑出声。