一切东西都必须用水煮沸，包括陈旧和生锈的手术器具：没有杀菌器。

Everything has to be boiled, including the old and rusty surgical instruments: there are no sterilizers.

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将蒸器放在水面上方，盖上锅盖，将水煮沸。

Place the steamer over the water, cover the pot, and bring the water to a boil.

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将420B型煮沸消毒器的机械定时器改为电子定时器，并加装显示电路，使其定时直观、工作稳定、便于维修。

Changes the mechanical timer of Type 420B boiling sterilizer into an electronic timer and adds a display circuit so as to make its timing ocular, operation stable and maintenance easy.

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