spongy metal

例句：

1. 1. The sponge is so soft that it can easily absorb liquid.
   海绵非常柔软，可以很容易地吸收液体。
2. 2.The sponge was too soft to hold the cake together.
   海绵太软了，无法将蛋糕粘合在一起。
3. 3. The sponge was used to make a soft and fluffy sponge cake.
   海绵被用来制作柔软蓬松的海绵蛋糕。