这个问题在序言中已粗略地提到了: the subject has been referred to cursorily in the preface
开端: beginning; start; open end 短语和例子良好的开端 a good beginning; 一个吉祥的开端 an auspicious beginning; 两国关系的新开端 a new turn in the relations between the two countries; 微不足道的开端往往会有伟大的结果。 it often happens
