课堂教学效率是指向教学目标的有效教学时间与实际教学时间的比率，它是实现教学目标的价值量度。
Classroom teaching efficiency means the ratio between the effective teaching time of teaching objectives and actual teaching time, and it is the measure of value of attaining the teaching objectives.
道指对黄金比率︰很多分析家也利用这比率来量度黄金和道指的长线走势。
Dow-gold ratio: Many analysts use this ratio to gauge the long-term trend of gold and the Dow Jones.
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