1.   But they have a hard outer shell.

2.   Holding it by the hard shell is safe enough, although a steady grip is recommended.

3.   In addition to their hard shell, tortoises and turtles sometimes possess special protective refinements.

4.   She had a hard shell like an oyster.

5.   Soft-shelled crabs are blue crabs taken after the hard shell has been discarded and the new one is still soft.

6.   The censure of her family was like a hard shell under which she found a certain freedom.

7.   The hard shell acts as a protective covering.

8.   Ancient metal smiths realized that tools or weapons would be more durable if the hard shell could somehow be inserted into the core of metal.

9.   Because some of the eyes are fixed in the hard outer shell of the spiders, the spider must move its whole head to see objects.

10.   But he was adamant that neither the so-called hairnet kind of leather helmet nor one with a hard shell would have made any difference to Casartelli.