四川建筑职业技术学院 授课教案 turn out: happen to be, or be found to be e.g. The party turned out a success rned out to be an old friend of my mother's 22. More research will be needed before we are sure how infra-sound can be used It is necessary for us to do more research in order to make sure that we can make good the information it the information the infra-sound gives may be of great importanc it"here refers to the"infra-sound"in the previous sentence vital: extremely important and necessary for something to succeed or exist e.g. Choosing the right equipment is vital If you are to avoid being blamed, it is vital that you should tell them the truth at once IV Summary of the Text A running vehicle makes infra-sound at between ten and twenty cycles per second which we cannot hear, but it can affect us because it can produce "euphoria recklessness, lower efficiency and dizziness. Professor Gavreau of Marseilles in his experiment discovered that infra-sound is extremely dangerous to the body. However, by detecting low-frequency vibrations, we can foretell the coming of an earthquake. So we need more research on how infra-sound can be used and how we can protect ourselves from being hurt by it. Text-related Information 1. Arizona: (AZ)a state in the southwest of the usa known for its desert climate 2. infra-sound Dangerous, destructive and harmful sound waves whose frequency is lower than 20 Hz and not audible to human ears 3. post-mortem(examination): autopsy, an examination of a dead body, esp by cutting it open to discover the cause of death四 川 建 筑 职 业 技 术 学 院 授 课 教 案 turn out: happen to be, or be found to be e.g. The party turned out a success. To our surprise, the stranger turned out to be an old friend of my mother's. 22. More research will be needed before we are sure how infra-sound can be used. -- It is necessary for us to do more research in order to make sure that we can make good use of the infra-sound. 23 .... the information it provides may be vital, ... -- ... the information the infra-sound gives may be of great importance .... "it" here refers to the "infra-sound" in the previous sentence. vital: extremely important and necessary for something to succeed or exist e.g. Choosing the right equipment is vital. If you are to avoid being blamed, it is vital that you should tell them the truth at once. IV. Summary of the Text A running vehicle makes infra-sound at between ten and twenty cycles per second which we cannot hear, but it can affect us because it can produce "euphoria, recklessness, lower efficiency and dizziness." Professor Gavreau of Marseilles in his experiment discovered that infra-sound is extremely dangerous to the body. However, by detecting low-frequency vibrations, we can foretell the coming of an earthquake. So we need more research on how infra-sound can be used and how we can protect ourselves from being hurt by it. Text-related Information 1. Arizona: (AZ) a state in the southwest of the USA known for its desert climate 2. infra-sound: Dangerous, destructive and harmful sound waves whose frequency is lower than 20 Hz and not audible to human ears 3. post-mortem (examination): autopsy, an examination of a dead body, esp. by cutting it open, to discover the cause of death