In one particular inherited disease, sickle cell anaemia, the red blood cells, instead of being flat discs, are sickle shaped.
在一种特殊的遗传疾病镰形细胞贫血症中，红血球不是圆盘状而是镰刀状。
Deinonychus, or "terrible claw" after the sickle-shaped talon on each hind foot, stood about 11 feet from head to tail and was a lithe predator.
这种被称为恐爪龙(Deinonychus)的恐龙后足上存在镰刀般的利爪，从头到尾的身长约为3.3米，是一种非常敏捷的掠食者。
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