Descriptive sound change consists of changes in soundflow, sound position and some other non-phonetic aspects while historical phonetic change is divided into two subtypes.
描写音变又包括语流音变、位置音变与非语音原因的音变；历史音变则分为有规律的演变与特殊的变化两小类。
2
His job is to sit beside the pianist and turn the pages of the score so the musician doesn't have to break the flow of sound by doing it themselves.
他的工作是坐在钢琴家旁边为乐谱翻页，这样音乐家就不必自己动手翻页而打乱演奏。
3
The steps we have taken over the last two years, including those we are announcing today, have put us on very sound financial footing with a strong balance sheet and substantial cash flow.