I--I have 50 pounds vacuum packed and ready to go.

我有50磅的货准备就绪。

However, coffee grains, when you buy them, sometimes they're vacuum packed, and when they're packed, they're really stiff and rigid like a brick.

但是，咖啡粒，你买的时候，有时候是真空包装的，包装的时候真的硬得像块砖头。

Listen to the rising and falling tones used by the woman in the next clip to explain the properties of granular materials: Take vacuum packed coffee for example.

听下一个片段中女人使用的上升和下降的音调来解释颗粒材料的特性：以真空包装的咖啡为例。