Please don't trample on the azaleas.请勿踩踏杜鹃花。Don't trample on the grass.勿踏草地.Don't trample mud from your shoes on to the floor; I've just this minute swept it.不要把你鞋上的泥踩在地板上, 我刚刚才扫过地....
欧洲音乐凑巧采用了八音音阶，“八度”一词就由此而来。European music happens to use a scale of eight notes, hence the use of the term octave.如果用竖琴演奏D音符，其他八度音阶所有相应的D弦都将发出共鸣。If the note of D is sounded on a harp, all the corresponding D strings of ot...