we need to take _____ measures to make the rivers clean (protect)

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• we need to take _____ measures to make the rivers clean (protect)
• we need to take _____ measures to make the rivers clean (protect)
• 英语语法：We need to get out clean without engaging the enemy.这里engage被翻译成什么合适?
• We need water to drink,to cook and to clean ourselevs.这里clean ourselevs是打扫自己么?太别扭了...We need water to drink,to cook and to clean ourselevs.这里clean ourselevs是打扫自己么?太别扭了,谁说哈