They can accompany heavy rains or follow droughts, earthquakes, or volcanic eruptions.
它们可能同时伴随有大雨或后续的旱灾，地震或火山喷发。
But those artifacts could be from volcanic eruptions or natural fires.
然而这些痕迹也可能是火山爆发或自然火造成的。
These things on the earth are actually all volcanic ash from volcanic eruptions.
地上的这些物质其实全部都是火山爆发时喷出的火山灰。
Both the first and third eruptions covered most of North America with ash.
第一和第三次的爆发的火山灰覆盖了大部分北美州。
Tinea capitis is manifested by pustular eruptions of the scalp, with scaling and bald patches.
头癣是补丁表现为脓疱爆发的秃头头皮，具有缩放和。
It belongs to the polymorphous volcanic cones, and is created by repetitious volcanic eruptions.
属复式火山锥，为火山多次喷发形成。
Most volcanic eruptions in recorded history have blown skyward.
历史上有记载的大多数火山喷发是向天空喷发的。
A volcanic cone is a conical mountain or hill built up of material from volcanic eruptions.
火山圆锥体是由火山爆发中产生的物质堆积而成的圆锥形山体或山丘。
Magma eruptions with high fractionation from picritic to andesitic in magma chambers of vents.
古火山口相从苦橄质到安山质高分异岩浆喷发。
Any of various skin diseases characterized by patchy eruptions of small, firm papules.
苔藓病一种皮肤病, 以出现斑状的小而硬的丘疹为特征
Volcanic eruptions are like fires in a chimney.
火山爆发就象烟囱里的火焰一样。
No, it was flare eruptions, which are the chromosphere and prominence on the landscape.
不，那是耀斑爆发，它与日珥都是色球层上的景观。
Its steep slopes are composed of many layers of hardened lava left from previous eruptions.
它陡峭的斜坡是由以前火山喷发时形成的硬化了熔岩组成。
Large volcanic eruptions spread cooling palls through the stratosphere.
大规模火山喷发将这种制冷物散播在平流层中。
Vesicular eruptions on the oral mucosa, teat and coronet of hooves
口腔粘膜, 乳头, 蹄冠部皮肤有水疱
However, some volcanic eruptions happen far from these crash sites.
然而某些火山喷发在离开这些碰撞很远的地方。
A series of volcanic eruptions developed along the fault.
一系列的火山爆发正在断层带酝酿。
Objective To discuss the relationship between drug eruptions and some sensitizing medicines.
目得探讨药疹与某些致敏药物得联系。
So, we are prone to earthquake and volcanic eruptions.
如此，我们是有倾向的对地震和火山爆发。
Volcanic eruptions are usually preceded by earthquakes.
在火山爆发之前常发生地震。
Such earthquakes can be an early warning of volcanic eruptions.
这类地震会是火山爆发得预警信号。
Everywhere, these mostly seabed eruptions are changing the environment.
每到一处，这些大多是海底火山喷发。
Scientists estimate there will be a spike in the number of such solar eruptions over the next three to five years.
科学家估计在未来的35年此类的太阳活动会达到高峰。
The most impressive volcanic phenomena are explosive eruptions.
最令人难忘得火山现象是爆炸喷发。
We watched explosive eruptions occur as frequently as several times per day.
我们观察到爆炸式得喷发频繁到每天有多次。
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