It highlights the contribution of continuous waves of immigrants.

【翻译】它强调了蜂拥不断的移民所做的贡献。

highlight：强调；突出

contribution：贡献。of continuous waves of immigrants作contribution的定语。

continuous waves of immigrants：不断的移民潮。

关于contribution 的用法：其后可以跟介词of 和to，差别如下：

1. the contribution of A ：A做的贡献

2. the contribution to B：对B的贡献

3. the contribution of A to B：A对B的贡献