and (for) those who are weak
And why should ye not fight in the cause of Allah and of those who, being weak, are ill-treated (and oppressed)?- Men, women, and children, whose cry is: "Our Lord! Rescue us from this town, whose people are oppressors; and raise for us from thee one who will protect; and raise for us from thee one who will help!"
Except those who are (really) weak and oppressed - men, women, and children - who have no means in their power, nor (a guide-post) to their way.
你们怎么不为(保护)主道和(解救)老弱妇孺而抗战呢?他们常说:“我们的主啊!求你从这个虐民所居的城市里把我们救出去。求你从你那里为我们委任一个保护者,求你从你们那里为我们委任一个援助者。”
惟老弱和妇孺,他们既无力迁移,又不认识道路。