At dusk, a red sky indicates that dry weather is on the way. This is due to the sun shining through dust particles being pushed ahead of a high pressure system bringing in dry air. A red sky in the morning is due to the sun again shining through dust.

【翻译】黄昏时，红色的天空预示着干燥的天气即将来临。这是因为阳光照射在被推挤在高气压流前面的尘埃颗粒中，高气压流带来了干燥的空气。早晨的天空是红红的，是因为太阳又一次在尘埃中闪耀。

【分析】This is due to the sun shining through dust particles being pushed ahead of a high pressure system bringing in dry air.

1. 句子主干是个“主系表”结构。

2. the sun shining through dust particles （动名词复合结构，the sun 是逻辑主语）being pushed ahead of a high pressure system （现在分词短语作定语，修饰dust particles；ahead of a high pressure system是介词短语表示“地点或位置”）bringing in dry air（现在分词短语作定语，修饰pressure system）

3. 下一句的the sun again shining through dust 也是动名词的复合结构。

如果把due to 改为because 的话，那么，because 就是一个表语从句：

This is because the sun shines through dust particles being pushed ahead of a high pressure system bringing in dry air. A red sky in the morning is because the sun again shines through dust.