I'm most grateful to you for taking so much trouble to explain the best way of getting there.
你不厌其烦地给我解释去那里的最佳途径,我对些深表感激。
So archaeologists have neither history nor legends to help them to find out where the first 'modern men' came from.
于是,考古学家们既缺乏历史记载,又无口头传说来帮助他们弄清最早的“现代人”是从哪里来的。