【推荐1】The causes of this ________(现象)are still incompletely understood. (根据汉语提示单词拼写)

【推荐2】…but many of today’s sound professionals are sharing their knowledge and experience with professionals in other fields to create new products based on the ________(现象) we call sound. (根据汉语提示单词拼写)

【推荐3】Even scientists cannot explain this natural ____________ (现象). (根据汉语提示单词拼写)

【推荐1】C__________________(气候)is a summary of weather conditions over a period of years.(根据中英文提示单词拼写)

【推荐2】His ________(申请) for membership of the organization was refused. （根据汉语提示单词拼写）

【推荐3】This painting is a copy; the ________ (原件) is in Rio. (根据汉语提示单词拼写)