In fact,the free-flight trajectory and reentry trajectory has close contacts,through these contacts,established unpowered trajectory of ballistic missiles applying to the entire trajectory equations.
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Through these contacts occurs the process of culture diffusion.
通过这些接触，就发生了文化的传播过程。
The purpose of these reciprocal visits is to advance international understanding, goodwill, and peace through person-to-person contacts across national boundaries.
这些相互访问及作客的目的是藉著跨越国界的面对面接触，进而促进国际了解、亲善与和平。
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