六氟化硫（SF6）气体是两个法国人首次合成，至今仍未在自然界找到它的天然产物。
Sulfur hexafluoride (SF6) gas is the first synthesis of two French people, has not yet found its natural products in nature.
春天是我们学习新的生活节奏的季节，许多人在自然界中找到舒适感。
In the spring, a season when we are learning new rhythms of life, many of us find comfort in the natural world.
（幻灯片出现：自然界遵循一定得规律，用牛顿的话说就是”自然哲学就是找出自然界规律的学科“（科学在牛顿那个年代称之为自然哲学）尽管人类不断努力去追寻这些规律的更精确形式，也许最终找到了他们的最终形式，但是这些规律不仅仅是人类的思维构想。
(slide-"Nature obeys laws and, in Newton's words, 'it is the business of natural philosophy to find them out.' (Natural philosophy was, in his day, the term for science.)
色素添加剂划分成两大类：从自然资源中(如植物，矿物，动物)获得的天然色素和不能在自然界中找到的人造色素。
Colour additives belong to one of two groups: pigments derived from natural sources such as vegetables, minerals or animals and those not found in nature and must be man-made.
反物质已在实验室中产生，但还未在自然界中找到。
Antimatter has been produced experimentally, but little of it is found in nature.
然而人类和怪兽为了寻找到麋鹿王国，残忍而不间断的向自然界发动着进攻，杀害了许多小动物也破坏了大自然的平衡。
However, humans and monsters in order to find elk kingdom, cruel and sustained to the natural world to launch an attack, killing many small animals also destroyed the natural balance.
在大多数情形下，自然界中只能找到稳定同位素。
In most cases, only stable isotopes of elements are found in nature.
生活在色彩之内：黄色。黄色唤起太阳放出异彩和寻找到在整个自然界还有人类制造世界如同一种颜色其命令注意。
Life in color: Yellow Yellow evokes the shine of the sun and is found throughout nature and the man-made world as a color that commands attention.
生活在色彩之内：黄色。黄色唤起太阳放出异彩和寻找到在整个自然界还有人类制造世界如同一种颜色其命令注意。
Life in color: Yellow Yellow evokes the shine of the sun and is found throughout nature and the man-made world as a color that commands attention.
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