An unknown parameter nonlinear system is investigated by means of wiener expansion theory.

利用维纳级理论研究了一类特性参数未知的非线性系统。

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Gas second expansion theory of base bleed is a kind of approach which can increase efficiency of base bleed.

底排燃气二次扩张原理是进一步提高底排增程效率的新技术途径。

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Sommerfeld's wave expansion theory demonstrates that a spherical wave can be expanded as the superposition of plane simple harmonic waves.

索末菲关于波的展开理论证明，球面波可以展开为平面简谐波的叠加。

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Other possible causes include hitters muscling themselves up as never before during the off-season, the creation of smaller baseball parks and a general decline in the quality of pitching (every time there is an expansion of the leagues, the theory goes, the pitching talent pool is stretched thin, and batters have a field day, so to speak).

FORBES: Fact And Comment

With a quantum theory of gravity, we may be able to trace the Big Bang expansion back to its very beginning, and understand precisely how our universe arose, presumably from nothing.

CNN: Higgs and the holy grail of physics

This observation led to the theory that some mysterious, gravitationally repulsive dark energy must be behind the rising expansion of the cosmos - although we don't really have the foggiest idea what that is.

BBC: Dark discussion ahead for Europe and US