to,also,fire,keep,they,their,safe,used,families 连成完整的句子
问题描述：
to,also,fire,keep,they,their,safe,used,families 连成完整的句子
答
参考如下：
They also used fire to keep their families safe.
答
They also used fire to keep their families safe. 他们当时也用火来使他们的家人得以安全。
答
They also used fire to keep their families safe.
他们也用火保护他们家人的安全