Achilles tendinitis is inflammation of the Achilles (uh-KIL-eez) tendon, the band of tissue that connects calf muscles at the back of the lower leg to your heel bone.
Dr. Kil Won Kim at the University of Incheon has also discovered another bizarre behavior by the mom-killing broods: pulsating rythmic vibrations.
韩国仁川大学的Kil Won Kim博士还发现了这些杀死亲生母亲的幼蛛们还有另一种奇怪的习性：有节奏的震动。
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"I never imagined that they would fire at us," said Lee Kil-yeo, one of the residents who stayed home on the island Wednesday. "I don't want to live here anymore."