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burn down, burn up, burn out

bum down 指“燒為平地，燒毀”；也指“火力減弱”。

The house was burnt down in an hour.

房子一小時被燒為平地。

bum up 有“燒旺”之意，也可指“消耗掉”。

You'd better put more wood on the fire to make it burn up.

你往火上添著柴，讓它燒旺。

bum out 指“火熄滅”。

The fire had burnt out before I returned.

在我回來前，火已經熄滅了。