solid shell

例句：

1. 1. The car is solid and sturdy.
   这辆车结实耐用。
2. 2. The cake was made from solid ingredients.
   这个蛋糕是用固体成分制成的。
3. 3. The ice cream was solid when I tried it.
   我尝了尝冰淇淋，它是固体的。