【简答题】California has lost half its big trees since the 1930s, according to a study to be published Tuesday and climate change seems to be a major factor( 因素 ). The number of trees larger than two feet acros...
【简答题】California has lost half its big trees since the 1930s, according to a study to be published Tuesday and climate change seems to be a major factor (因素) . The number of trees larger than two feet acros...