存在：氦存在于自然大气中，在土壤中沉积，而且能从空气中分离出来。
Occurrence: Helium comes from natural gas, deposits within Earth, and can be isolated from air.
而新的激光技术就不同了，因为它是利用自然的湿度和大气的条件来制造水滴的。
The new laser method is different because it uses natural humidity levels and atmospheric conditions to create water droplets.
自然灾害是指大气、地质或水文等因素造成的灾变，包括地震、火山爆发、泥石流、海啸、洪水和干旱等。
Natural disasters are catastrophic events with atmospheric, geologic, and hydrologic origins. Disasters include earthquakes, volcanic eruptions, landslides, tsunamis, floods, and drought.
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