zhè / xiàng / shíyàn / yāoqiú / ránliào / shǐzhōng / dīyú / yàlínjiè / xiànzhí / rènhé / yìcháng / dōu / bìxū / lìjí / bàogào

这项实验要求燃料始终低于亚临界限值，任何异常都必须立即报告。

This experiment requires the fuel to remain below the subcritical limit at all times, and any abnormality must be reported immediately.