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1.As the algae dies, it sinks to the bottom of the river where it breaks down or decomposes.
break down 分解；发生故障；失败；毁掉；制服
Talks with business leaders broke down last night.
与商界领导人的谈判于昨晚失败了。
Over time, the protein in the eggshell breaks down into its constituent amino acids.
随着时间的推移,蛋壳中的蛋白质分解成其构成成分氨基酸。
