spongy substance of bones

例句：

1. 1. The sponge was so soft that itcould easily soak up water.
   这块海绵太软了，很容易吸水。
2. 2. Thesponge is used to cleandishes and remove stains.
   海绵用来洗碗和去除污渍。
3. 3. The spongehas a spongy texture that makesit ideal for cleaning.
   海绵具有海绵状的质地，非常适合清洁。