ReportLab 文本重叠

ReportLab text overlapping

我对 reportlab pdf 创建完全陌生。我正在尝试打印几行,这是我得到的输出。如何增加行间距?

doc = SimpleDocTemplate("form.pdf", pagesize=(3.93*inch, 5.77*inch), rightMargin=10,leftMargin=10, topMargin=1.67*inch, bottomMargin=0.77*inch)
Story=[]

styles=getSampleStyleSheet()
styles.add(ParagraphStyle(name='Center', alignment=TA_CENTER))
styles.wordWrap = 'LTR'

ptext = '<font size=18 face=Vera-Bold>We would like to welcome you We would like to welcome you</font>'

ParagraphStyleleading 参数改大一些。