音标:['fә:stli]
ad. 第一, 首先
英汉词典
firstly的短语、例句:
firstly
adv (in giving a list) to begin with (用於列举事项)首先, 第一
The illness can develop in two ways
firstly, in cases of high blood pressure and secondly... 这种病有两种情况
第一, 由高血压引起; 第二....
firstly