阅读理解。 Do you know fish come out of  eggs when they are born? After the little fish comes out of the egg, it eats the food in the egg.  When it is big, it leaves the egg. It swims in the water. You can see the eyes and nose. Its ears are hidden in the head.Some fish eat other fish. Some fish have small mouths and teeth and they often eat plants. The fish that eat other fish need larger mouths and strong teeth. Fish are usually dark on the top and light on the bottom. 阅读短文，根据短文内容回答下列问题。 1. 将画线部分翻译成中文。 2. What do baby fish eat when they come out of the egg? 3. Do they have ears? Where are they? 4. Do all the fish eat fish?