He is banking up the fire.

他正在封火.

辞典例句

To extinguish ( a fire, for example ) by cutting off air.

封火, 灭火通过隔绝空气来熄灭 ( 如火等 )

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Bank up the fire , the flame is getting weaker and weaker.

封火吧, 火苗越来越小了.

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I told him not to forget to bank up the fire before he went to bed.

我叫他去睡觉前别忘了封火.

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