... directional tendency 方位趋势 directional tool 随钻测斜仪 directional turbodrill 定向涡轮钻具 ...
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bilingual and bi-directional tendency 双语双向
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Having no particular orientation or directional characteristics. Also having no tendency to change position.
没有特别的取向或方向特征，也没有改变位置的倾向。
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The principle and development tendency of different directional technologies were expounded.
阐述了不同定向凝固方法的原理以及定向凝固技术的发展趋势。
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