1. In heavy concentrations, ozone is irritating to the eyes, nose and throat. 浓度极高时，臭氧对眼睛、鼻子和喉咙是有刺激的。
2. They can thrive in soil with high concentrations of metals that are toxic to most other plants. 它们能在含有对大多数其他植物有毒的高浓度金属的土壤中茁壮成长。
3. A number of neurotransmitters exert their effects by first increasing cyclic AMP concentrations in target neurons. 许多神经递质首先通过增加靶神经元中的循环 AMP 浓度来发挥其作用。
4. Seawater samples from the area where the seals died did contain unusually high concentrations of the toxic bacterium. 来自海豹死亡海域的海水样本确实含有异常高浓度的有毒细菌。
5. Tomorrow, we will dump a slightly larger amount, with the cumulative concentrations now trapping more and more heat from the sun. 明天，我们会释放出更大的量，累积的浓度现在会吸收越来越多的来自太阳的热量。
