洗衣粉的英文是 "laundry detergent"。它的来源是由 "laundry"（洗衣）和 "detergent"（清洁剂）组成。

一些例句及其中文翻译如下：

Please put some laundry detergent in the washing machine before starting the wash cycle. (请在开始洗涤周期前，将一些洗衣粉放入洗衣机中。)

I prefer using eco-friendly laundry detergent to protect the environment. (我更喜欢使用环保洗衣粉来保护环境。)

I always make sure to check the instructions on the laundry detergent bottle before using it. (我总是确保在使用洗衣粉之前查看瓶子上的说明。)