undertaken 英语翻译But it must be undertaken slowly and carried on only if

题目：

英语翻译But it must be undertaken slowly and carried on only if there are signs of interest and action in return

解答：

但是它必须被缓慢地实施,并且只有在有兴趣和行动作为回应的迹象的时候才能继续.but it must be undertaken slowly,and it must be carried on only if there are signs of (interest and action in return).