low concentrations of acid gas 低浓度酸性气
Low concentrations of chemotherapeutic drugs 低浓度化疗药物
triple-molecular model with low concentrations 低浓度三分子模型
low sublethal concentrations 次亚致死剂量
The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment.
分子生物学的新技术使最近的工作成为可能，这种新技术能在环境中检测到低浓度的病毒 DNA。
Even caffeine, which is generally known only for its stimulatory effects, displays this property, depressing mouse locomotion at very low concentrations and stimulating it at higher ones.
就连人们通常觉得有刺激作用的咖啡因，也表现出了这种特性，它在浓度极低的情况下会抑制老鼠的运动，而在浓度较高的情况下则会刺激老鼠。
These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving.
这些地区的铁含量特别低，海洋学家推测，铁的缺乏阻碍了浮游生物的繁殖。
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