绊脚石正是它们对空间和时间观念的冲突。
The stumbling block lies with their conflicting views of space and time.
正是黑洞这一观念使我们对物质、时间、空间等常识性概念产生混乱。
The very concept of black holes confuses our common sense notions of matter time and space.
通过含有98项问题的问卷调查，对男、女大学生参加体育活动的观念，时间、空间分布，体育消费意识与结构等，进行分析和讨论，并提出建议。
Through a 98 questioned public opinion poll, this passage analyses and discusses the conception, time, space distribution, sports consumption ideology and structure and give some advice.
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