This is the 7999th most frequent Chinese word.
arm
In Chinese, "arm" translates to 手臂 (shǒu bì), meaning the upper limb of the human body.
In this sentence, '手臂' (shǒubì) refers to the physical part of the human body that comprises the appendages connected to the shoulders, known as arms.
他的手臂很强壮，是举重运动员。
His arms are strong; he is a weightlifter.
Here, '手臂' is metaphorically used to describe the mechanical limb of a robot, emphasizing functional similarity to a human arm.
机器人的手臂可以旋转180度。
The arm of the robot can rotate 180 degrees.
In this usage, '手臂' refers to the human arm, but it connotes the action of reaching out, highlighting its dynamic use in providing aid.