还要过很长一段时间,普通人才能去太空旅行.(before)
问题描述：
还要过很长一段时间,普通人才能去太空旅行.(before)
答
there is still long time before normal people can travel to the space.
还要过很长一段时间,普通人才能去太空旅行.(before)
there is still long time before normal people can travel to the space.