It is usually economical to buy washing powder in large quantities.

大量购买洗衣粉通常要省钱些。

How much washing powder has he get?

他有多少洗衣粉？

The washing powder don't have bubble.

这洗衣粉没有泡沫。

Do I need to put some washing powder in?

我需要加洗衣粉进去吗？

What are you talking about, washing powder?

你说什么，是洗衣粉？