But larger granular materials, like this table sugar, which in this demonstration represents sand, they avalanche at a much shallower angle, because they can't pack as tightly.

但是较大的颗粒状材料，比如蔗糖，在这个演示中代表沙子，它们以更浅的角度崩塌，因为它们无法挨得那么紧。

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。

When listing things a rise-falling tone is used: Granular materials constitute a wide range of everyday common materials, such as powders through to natural grains such as nuts, rice, wheat grains and mineral resources.

列出事物时使用上升下降的色调：颗粒状材料构成范围广泛的日常常见材料，例如粉末到天然谷物，例如坚果、大米、麦粒和矿产资源。