CALENDAR AND SEASONS - 2

• nineteen hundred
• nineteen-oh-one
• nineteen ten
• two thousand
• two thousand and one
• twenty thirty-three
  //
• once a week
• twice a week
• three times a week
• every day
• every other day
• only weekends
• hourly
• daily
• weekly
• monthly
  //
• spring
• new leaves
• summer
• green foliage/ˈfəʊliɪdʒ/ 枝叶（树的）
• fall(US)/autumn(UK)
• leaf fall 叶（花朵）
• winter
• bare branches

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• 1900
• 1901
• 1910
• 2000
• 2001
• 2033
  //
  时间频率
  //
  季节