例句與造句

1. This is conferred by the presence of beta-keratin, which provides a much more rigid skin layer.
2. Individuals with RD exhibit growth retardation starting in the uterus, tight and rigid skin with erosions, prominent super
   鹀ial epidermal hyperkeratosis, abnormal facial features ( small mouth, small pinched nose and micrognathia ), sparse or absent eyelashes and eyebrows, mineralization defects of the skull, thin dysplastic clavicles, pulmonary hypoplasia and multiple joint contractures.
3. It's difficult to find rigid skin in a sentence. 用rigid skin造句挺難的