对芦笙多种二次共鸣形式及发音原理进行分析，不失为一种积极的探索。
It is an active exploration to analyze the forms of various second resonances and the principle of the sound production.
对对流项和湍流应力项进行二次显式滤波，并对湍流应力的分解形式作了相应改进。
A second filtering was applied to the convective and turbulent stress terms, and a new separation of the turbulent stresses was proposed.
平面二次包络环面蜗杆副这种优良的传动形式一直不能得到广泛应用的原因就在于其设计参数多、加工工艺复杂，并且对误差很敏感。
The reason of such fine transmission form can not be used widely of two packs of worm pairs lie in their design parameter more, complicated processing technology and very sensitive to the error.
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