normal concentration

基本解释

However, the content of iridium in the rock formation is 200 times the normal concentration.
然而这个岩层中的铱含量是正常含量的200倍。
Carbon dioxide at higher than normal concentration is one way of experimentally inducing panic in animals as well as in humans.
二氧化碳的浓度高于正常标准是一种实验方法包括对人和动物恐慌症的研究。
In mice with normal ovaries and approximately half the normal concentration of FSH, bone mass increased due to a decline in bone resorption by cells known as osteoclasts, which break down bone.
卵巢功能正常和FSH接近正常浓度一半的小白鼠，由于破骨细胞的破骨作用引起骨吸收作用的减弱，从而使骨量增加。

The concentration of xenon was eight times higher than normal, and the presence of the gas is indicative of nuclear activities.
FORBES: Magazine Article