But when two H-bots became imperiled, the robot choked 42 percent of the time, unable to decide which to save and letting them both.
2017年12月六级真题（第二套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
哽住的;哽咽的
If you say something in a choked voice or if your voice is choked with emotion, your voice does not have its full sound, because you are upset or frightened.