当他在各领域—包括消费者行为、财政学、国际贸易、商业周期—辛勤耕耘时，总是遭遇到一些类似的、屈从于数学技巧的同一局限的问题。

As he laboured in each field-consumer behaviour, public finance, international trade, business cycles-he encountered similar problems, which yielded to the same set of mathematical techniques.

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虽然斑秃一般表现为限局性毛发脱落，但整个头皮毛发均有生长周期异常改变。

Though clinically manifested by localized hair loss, a generalized hair cycle abnormality was found in the whole scalp hair of alopecia areata.

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讨论在F—P腔中无吸收的非线性周期结构光学介质的限光条件。

Condition of limiting light of nil suck nonlinearity periodic structure optical medium filled in F-P cavity are discussed in this paper.

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