If physics is not an obstacle, however, the problem could still be constrained by logic.
如果物理学不是这方面的障碍，那么问题可能还是逻辑上的。
The problem of knowing what Afghans think is an obstacle more generally.
一般地说，理解阿富汗人的想法存在障碍问题。
But reproductive obstacle disease and feed demerits are the outstanding problem.
而繁殖障碍性疾病和饲养管理不当是突出的问题。
Therefore, crossing over time and space obstacle are the key and the difficult problem.
因此。跨越时间和空间障碍是研究的关键和难点。
Therefore, crossing over time and space obstacle are the key and the difficult problem.
因此。跨越时间和空间障碍是研究的关键和难点。
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