These functions (ratios) are of fundamental importance in the study of trigonometry. They must be memorized.

这些函数关系是学习三角函数的基础，务必牢记，熟练运用。

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In addition, the empirical formulas for estimating the ratios of 2nd and 3th mode periods to the fundamental period are put forward through statistical analysis.

同时，通过统计分析给出第二振型、第三振型周期与基本周期比值的经验公式。

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Statistical analysis for cross-sectional area ratios of chord and web members commonly used in steel roof trusses are also provided for reference in predictng fundamental calculation parameters.

对常用钢屋架的弦杆腹杆截面积比值作了统计分析，以便设计者能更准确地确定计算原始参数。

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For the long-term, growth rates, price earnings ratios and other fundamental metrics will matter, but in the short-term, it is all about supply and demand.

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Some stocks appeal to traders because of their price and volume action, while others appeal to investors who rely more on fundamental analysis: things like price-earnings ratios, sales growth, debt levels and the like.

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