主要观点; 主要话题; 主要题目; 精选例句 高考 1、 Football is his main topic of conversation. 足球是他的主要话题. 来源:互联网 2、 Operational risk econometric model has become the main topic being studied by the bank industry. 操作风险的量化模型已经成为银行业目前研究的主要课题. 来源:互联网