nà / zhī / tàn / xiǎn / duì / jìn / rù / shēn / shān / hòu / yǒu / qù / wú / huí / jiā / rén / yì / zhí / fàng / xīn / bù / xià

那支探险队进入深山后有去无回，家人一直放心不下。

After the expedition entered the deep mountains, no one ever came back, and their families remained worried.