对多层均匀介质板，正、反两方向上的正入射复透射系数相同。
To multilayer acoustical panel, the complex transmission coefficients of multilayer both forward and backward incidences are definitely the same.
复极点的实部是不稳定局域模的能量，虚部是它寿命的倒数，自然地得到了寿命为正的限制。
The real part of the complex pole is the energy of an unstable localized mode, and the reciprocal of the imaginary part is its life-time. Naturally the life-time is positive.
包括缺角、胚饼用错、正背面复打及模具锉痕等。
Errors include edge clips, COINS struck on foreign planchet, flip over double strikes, and filled dies etc.
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