The structures of primary , secondary and tertiary industries tend to become balanced.

三次产业结构趋向协调.

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The major stress categories are primary, Secondary and peak.

应力主要分为一次应力 、 二次应力和峰值应力.

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The paper was introduction fatty primary secondary amine of secondary amines and production process and application.

本文介绍了脂肪仲胺的反应原理、生产工艺及其应用.

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The continuation of art education lies in rules and conditions from primary secondary schools to universities.

大、中、小学艺术教育衔接出现断流现象的原因可归为规则与条件两个方面.

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