Vous avez cherché: 必须谴责这种做法 (Chinois (simplifié) - Anglais)

为了使对话和谈判取得成功，必须谴责这种做法。
for dialogue and negotiation to succeed, such practices must be renounced.

必须谴责这种做法，我们必须有足够的勇气来谴责这些行为，并通过这种方式来支持和平。
that must also be denounced and we must be courageous enough to denounce those actions and, in that manner, support peace.

必须停止这种做法。
such conduct must be put to an end.