阅读短文，在空白处填入适当的单词或括号内单词的正确形式(有提示词的空格不限一词，无提示词的空格限一词)
Picture this: humanoid (类人的) robots lining up, ready to join human runners in a 21-kilometre
race. It sounds like a film, but it really $^{(1)}$
(happen) on 19 April 2025 at the world's first
half-marathon for humanoid robots in Beijing. Six out of 20 robot runners finished the race.
The race wasn't easy. Some robots $^{(2)}$
(fall) soon after the start, while some broke
down halfway through.
Why is running so hard for robots? In fact, in the beginning, $^{(3)}$ ______ (walk) on two feet
was not easy for us, either. It needed big changes in our bodies, like a shorter and wider pelvis (骨
盆). Humans started walking this way about 6 $^{(4)}$
7 million years ago.
Humanoid robots copy $^{(5)}$
we walk using actuators (执行器) and effectors (效应
器). Actuators give power to move; effectors, like arms and legs, help robots deal $^{(6)}$
the
environment. All these parts must work together for robots to move.
Running a half-marathon is even $^{(7)}$
(hard). China Science Communication said a
humanoid robot needed to make about 250,000 joint (关节) movements during the race. It also faced
$^{(8)}$
(problem) like bumpy (颠簸的) ground and short battery life.
If it's so difficult for robots to move like us, why not build them $^{(9)}$
(different)? The
reason is that our world, from doors to stairs, $^{(10)}$
(build) for humans. So, only humanoid
robots can get around in these spaces, said Humanoid Robotics Technology.
