木质纤维素的结构导致其不易降解。
The structure of lignocellulose makes it hard to be degraded.
POP不易降解，可以长期完整地存在于环境中。
POPs do not degrade easily, but remain intact in the environment for long periods of time.
严格控制向海域排放含有不易降解的有机物和重金属的废水。
The discharge of waste water containing persistent organic matters and waste water containing heavy metals shall be strictly controlled.
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