规则变化:
一般情况下是直接加ed，例如: bow过去式为bowed
The bowed trunk is covered with buds and flowers.
弯曲的树干上长满了花蕾。
She bowed her head in shame.
她羞愧地低下了头。
He bowed low to the assembled crowd.
他向集结的人群深深地鞠了一躬。
He bowed and gallantly kissed my hand.
他鞠了一躬，殷勤地吻了吻我的手。
He smiled and bowed obsequiously to Wilson.
他谄媚地对威尔逊鞠躬微笑。
