This is a natural cycle of life.
这是自然的生命周期。
David: Some think it's part of the earth's natural cycle.
大卫：有些认为是地球自然循环的一部份。
All of this is a natural cycle that everyone must go through.
但所有这些不过是每个人都要经历的自然周期罢了。
This will help combat insomnia by giving in to your body's natural cycle.
适应你身体自然循环后，这将有助于抗击失眠。
However, research has shown that this kind of drought is part of a natural cycle.
但许多研究表明，这种干旱也是自然循环的一部分。
MOST natural disasters do not have a major impact on the business cycle.
多数自然灾害不会对经济周期产生重大影响。
MOST natural disasters do not have a major impact on the business cycle.
多数自然灾害不会对经济周期产生重大影响。
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