He was discoursing to us on Keats.他正给我们讲济慈.They were discoursing over the latest gossip.他们在谈论最近的蜚短流长.They have been discoursing learnedly on this problem.他一直在深入研究这个问题....

vi.演说（discourse的现在分词形式）...

discoursing的音标：...