asseverating

The old kammerherr at one end could be heard asseverating to an elderly baroness his ardent love for her, while she laughed.

可以听见，在餐桌的一端，有个年老的宫廷高级侍从硬要一个年老的男爵夫人相信他怀有热爱她的诚心，她听后哈哈大笑。