At the beginning of 20th century
Beginning
开始
初
期初
起点
开
初期
磁带
起步
块
滚动密角钥发生器
滚动密钺产生器
开头
开端
朔
起算点
Beginning and end times
Beginning and Ending Date
beginning and ending dates of heating period
beginning date of air temperatures of 10 ℃
beginning date of air temperatures of 10℃
beginning date of boundary temperature 10℃
Beginning date of farming period
beginning date of peach flowering
beginning date of snow cover
beginning occurrence stage
beginning of fatigue failure