自然环境，自然循环

natural child───亲生子女；非婚生子女；私生子女

natural dye───天然染料

natural causes───自然因素

natural fibre───[纺]天然纤维

natural grace───自然的优雅

natural slope───天然坡

natural world───自然界；物质世界

water cycle───n.水文循环；水上脚踏车

natural children───私生子女

Skeptics say global warming is part of a natural cycle of climate change.───怀疑态度的人士认为，全球气温上升是气候变化自然循环的一部分。

This will help combat insomnia by giving in to your body's natural cycle.───你身体自然循环后，这将有助于抗击失眠。

Human biological rhythms are related to the natural cycle of day and night.───人的生物节奏与昼夜的自然循环有关.

The money raising is part of a natural cycle.───筹资是自然周期的一部分.

It is neither his fault nor her fault. It is a natural cycle.───这既非他的错,也非她的错, 而是由自然的周期.

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。

Life is a natural cycle, just like the changing seasons.

Life is a natural cycle just like the changing seasons so youth must move to middle age and then proceed to death.

The transfer took place during a natural cycle, and, to date, the pregnancy has gone smoothly.

Humans are born, and they die; all is part of the natural cycle of birth and death.