有推论说，由于火山尘埃带电物质相互撞击而诱发火山闪电。
One theory is that it is caused by charge-inducing collisions in volcanic dust.
火山尘埃中微小的粉尘与玻璃粒子就像飘浮在城市上空的烟雾颗粒，改变了日出日落的色彩。
The microscopic dust and glass particles in volcanic ash can act like the smog particles that hover above cities and change the color of sunrises and sunsets.
当然，太阳活动仅仅是气候变化的一个自然因素，火山喷发出气体和尘埃进入大气层也会带来这个结果。
Of course, solar activity is just one natural source of climate variability. Volcanic eruptions are another, spewing gas and dust into the atmosphere.
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