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| Terms for subject Environment (7358 entries) |
| acid rain (Rain having a pH less than 5.6. The acidity results from chemical reactions occurring when water, sulphur dioxide, and nitrogen oxides, generally released by industrial processes, are chemically transformed into sulphuric and nitric acids) | 酸雨 | |
| acid-forming gas | 形成酸性气体 | |
| acidification (Addition of an acid to a solution until the pH falls below 7) | 酸化 | |
| acidity (The state of being acid that is of being capable of transferring a hydrogen ion in solution) | 酸性 | |
| acidity degree (The amount of acid present in a solution, often expressed in terms of pH) | 酸度 | |
| acoustic comfort | 声舒适 | |
| acoustic filter (A device employed to reject sound in a particular range of frequencies while passing sound in another range of frequencies) | 滤声器 | |
| acoustic insulation (The process of preventing the transmission of sound by surrounding with a nonconducting material) | 隔音 | |
| acoustic level (Physical quantity of sound measured, usually expressed in decibels) | 声强 | |
| acoustic property (The characteristics found within a structure that determine the quality of sound in its relevance to hearing) | 声学特性 | |
| acoustical quality (The characteristics of a confined space that determines its ability to enable music and speech to be heard clearly within it) | 声学质量 | |
| acoustics (The science of the production, transmission and effects of sound) | 声学 | |
| act (1. Something done voluntarily by a person, and of such a nature that certain legal consequences attach to it. 2. Documents, decrees, edicts, laws, judgments, etc.) | 行为；法令 | |
| actinide (A group of 15 radioactive elements some of which occur naturally while others are produced in nuclear reactions. They include plutonium, americium and neptunium. The health hazard presented by the actinides, if they are released into the environment, comes from the potency of their radioactive characteristics. They are alpha-emitters, and therefore can cause intense localized damage in tissues if absorbed into the body) | 锕类 | |
| actinium (A radioactive element of the actinide series, occurring as a decay product of uranium. It is used as an alpha particle source and in neutron production) | 锕 | |
| actinium A | 锕 A | |
| action group (A collection of persons united to address specific sociopolitical or socioeconomic concerns) | 行动组 | |
| activated carbon (A powdered, granular or pelleted form of amorphous carbon characterized by a very large surface area per unit volume because of an enormous number of fine pores) | 活性炭 | |
| activated sludge (Sludge that has been aerated and subjected to bacterial action; used to speed breakdown of organism matter in raw sewage during secondary waste treatment) | 活性泥 | |
| activated sludge | 活性的污泥 |