求翻译：1930年后传入美国和加拿大，在原有的基础上又逐渐配上舞蹈、音乐和节奏。起初仅作为两场游泳比赛的场间娱乐节目，后来逐渐融入舞蹈和音乐，成为一项优美的水上竞技项目。是什么意思？

1930, after the introduction of the United States and Canada, but on the basis of the original gradually accompanied dance, music and rhythm. At first only as two swimming competition between the entertainment field, then gradually into the dance and music, as a beautiful water sports items.

After 1930, spread to the United States and Canada on the basis of their original dance, music, and gradually the Placing and pace. Initially only as a two-game entertainment programs of swimming competition, but gradually integrate into the dance and music, and become a beautiful water sports.

In 1930 rear-drive entered US and Canada, was joined to the dance, music and the rhythm gradually in the original foundation.At first only took two swim meets between the field the entertainment program, afterwards gradually integrated the dance and music, became an exquisite aquatic athletics proje

1930 years later United States Canada, original Foundation gradually accompanied by dance on, music and rhythms. At first only as two swimming events entertainment, then gradually into the dance and music, becoming a beautiful water sports events.

1930, after the introduction of the United States and Canada, but on the basis of the original gradually accompanied dance, music and rhythm. At first only as two swimming competition between the entertainment field, then gradually into the dance and music, as a beautiful water sports items.