It also describes the vast land and complex geographic and climate conditions as factors contributing to biodiversity in China.

文件还描述了广阔的土地和复杂的地理和气候条件，这些都是促成中国生物多样性的因素。

It's a complex condition to identify，but researchers are now a step closer using medical imaging techniques commonly known as MRIs.

由于抑郁症病症很复杂，所以很难确诊，但通过一个名叫核磁共振的图像技术，研究人员距离确诊又近了一步。

Many years of research show that substance use disorders are complex, chronic, and treatable medical conditions that involve changes in our brains.

多年的研究表明，物质使用障碍是一种复杂、慢性且可治疗的疾病，涉及我们大脑的变化。

He said the strike was " a mistake that followed a misidentification – at night during a war in very complex conditions. It shouldn't have happened."

他说，这次袭击是“一次辨认失误后的误击——当时是在情况非常复杂的夜间战争中。这本不该发生。”

For more complex conditions, like cancer, where multiple genes might be involved, CRISPR can be used for research to understand the disease better.

对于更复杂的疾病，例如癌症，可能涉及多个基因，CRISPR 可用于研究以更好地了解这种疾病。

Education must fit the complex conditions of a new society, always accelerating its movement, and its fitness could be known only from success.

教育必须适应新社会的复杂条件， 不断加速其运动， 只有成功才能知道它是否适合。

Mental disorders, although complex conditions involving factors that contribute to the development of symptoms, can be addressed effectively by changing small daily habits that tackle one's mind, brain, body and spirit.

虽然导致精神疾病症状发展的因素为十分复杂的条件所影响，它也可以通过改变小的日常习惯的得到缓解——放松一个人的思想、大脑、身体和精神。

There are many factors that play into this very complex condition, and more and more data is showing that saturated fat in the context of a low carbohydrate diet is not one of them.

心脏病有很多致病因素，但越来越多的研究数据表明，采用低碳水饮食时摄入的饱和脂肪绝不是这些因素中的一员。

If man can by patience select variations useful to him, why, under changing and complex conditions of life, should not variations useful to nature's living products often arise, and be preserved or selected?

如果人类可以通过耐心选择对他有用的变异， 为什么在不断变化和复杂的生活条件下，对自然界生物产品有用的变异不应该经常出现， 并被保存或选择？

As we mentioned up top, ADHD is a really complex condition, and there are other theories as to what might be going on, and even other approaches to correcting these kinds of sleep patterns beyond just taking melatonin.

正如我们前面所提，多动症是一种非常复杂的疾病，关于可能发生的情况还有其他的理论，甚至还有其他方法来纠正这种睡眠模式，而不仅仅是服用褪黑激素。