The spray of light scattered forward by these fields could push the object backward, against the movement of the beam itself.

光穿过这些场产生衍射，发散如喷雾状的衍射光向前方传播，因此对物体产生了一个与光束传播方向相反的推动。

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In order to search for the optimizing solutions of tool switching problem effectively, a beam search based heuristic algorithm is put forward for formulating heuristic solution space of the problem.

为了有效地搜索到刀具交换问题的优化解，本文提出了基于定向搜索的启发式算法的求解方法。

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Some problems existing in the construction of prestressed concrete box beam are introduced, and some views and measures are put forward in the paper.

介绍了预应力混凝土箱梁施工中存在的问题，提出了自己的见解及相应的措施。

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