这位母亲现在必须改变方式，妥善处理前夫和儿子之间关系，否则会失去监护权。
The mother now has to change her approach to her partner and child's relationship in order to keep custody.
为避免城市污水污泥产生二次污染，必须对其进行妥善处理与处置。
The treatment and disposal of sludge is essential in the process of wastewater treatment.
为避免城市污水污泥产生二次污染，必须对其进行妥善处理与处置。
The treatment and disposal of sludge is essential in the process of wastewater treatment.
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