Conventional wisdom says our earliest ancestors first stood up on two legs when they moved out of the forest and into the open savannas.

传统观点认为当人类最早的祖先最初从丛林迁移到平原时，开始用两条腿站立。

youdao

For two legs are open comminuted fracture, does not affect the future of the limb function in patients with as far as possible, the doctors have struggled to operation for nearly four hours.

因两腿都是开放性粉碎性骨折，为尽量不影响患者今后的肢体功能，医生们费尽心思，手术整整进行了近4个小时。

youdao