通过声学测试，团队发现了能穿透ANC耳机滤波器的狭窄频段——“安全间隙”，介于750-780赫兹之间。车铃在此频率发声，并配备额外谐振器（故名DuoBell），通过特制击锤机构产生快速不规则敲击，形成降噪算法无法及时抑制的声波。
"When I saw it in our studio when it was restored, I was immediately struck by the incredible power it has," Rijksmuseum director Taco Dibbits said.
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This report was first published by Engadget at https://www.engadget.com/transportation/toyotas-still-trying-to-make-hydrogen-fuel-cells-happen-202237728.html?src=rss
第三级（多步骤深度推理）与第四级（高不确定性宏观预测）作为核心难点，共同占据70%分值。
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