sickle

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He swished the tops off weeds with a sickle.
他挥动镰刀嗖嗖地割掉了杂草的草尖。
Family history. If your family has a history of an inherited anemia, such as sickle cell anemia, you also may be at increased risk of the condition.
家族史如果你有亲人患有遗传性的贫血，比如镰刀细胞性贫血，那么你患有这种贫血的风险也会比一般人高。
On Christmas Day in 1991, the Hammer and Sickle Flag of the Soviet Union was lowered for the last time above the Kremlin and replaced with the Russian flag.
1991年圣诞节的那一天，以镰刀斧头为标志的苏联国旗在克里姆林宫最后一次地降了下来，并用俄罗斯国旗所取代。

They become sticky and harden into the shape of the letter C, like a sickle, a hand tool with a curved blade.
Here the unique thing was that there's a restriction site inside that is present in normal DNA and not present in sickle DNA.
刚才例子中,特性就是在正常的基因中,有酶切位点,而在患者的基因中却没有
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It's a single gene defect and we know exactly where the genetic defect is in sickle cell.
是一种单基因缺陷,而且我们准确地知道,镰状红细胞贫血的基因缺陷在哪里
耶鲁公开课 - 生物医学工程探索课程节选

Variations in the between-gene regions have been linked to sickle cell anemia and diabetes.
FORBES: Magazine Article

a tool with a short handle and a curved blade, used for cutting grass and grain crops

A sickle is a tool that is used for cutting grass and grain crops. It has a short handle and a long curved blade.