birr
- n.动力，活力，精力;比尔（埃塞俄比亚和厄立特里亚国基本货币单位）
- v.作呼呼声；呼呼（声中）移动;使发出旋转声
birrnoun
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1
- sound of something in rapid motion
- whir of a bird's wings
- the whir of the propellers
- Synonym: whir whirr whirring
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2
- the basic unit of money in Ethiopia;equal to 100 cents
verb
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1
- make a soft swishing sound
- the motor whirred
- the car engine purred
- Synonym: whizz whiz whirr whir purr
数据来源：WordNet
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BIRR Model and the Use of a Macroeconomic Factor Model in China 's Stock Market Macroscopic Observation
宏观因子套利定价模型的因子筛选及在中国股票市场的应用
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Referring to BIRR model , the paper develops a macroeconomic factors model in China 's stock market .
本文以BIRR模型为参照，筛选出适用于中国股市的宏观因子套利定价模型中的宏观风险因子。
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In order to overcome slow convergence rate of the standard BP algorithm , this paper presents an adaptive backpropagation algorithm which can update learning rate and birr factor automatically based on dynamical training error rate of change .
本文针对BP算法存在收敛速度慢的缺点，提出一种基于网络动态训练误差变化率自动校正学习步长和冲量因子的自适应反向传播算法。
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The salt trade here is taxing , with workers using basic picks and axes to chop and cut the bricks of salt while standing out in the extreme heat for just 150 Ethiopian birr per day .
这里的盐类贸易正在征税，工人使用基本的镐和斧头切盐块。而在烈日下站立一天的他们，每天只有150埃塞俄比亚比尔的收入。