2. 职称英语
  3. [audioFiles]2015m8x/audio_ezfj_ezflisteningd_20157_078[/audioFiles]

[audioFiles]2015m8x/audio_ezfj_ezflisteningd_20157_078[/audioFiles]

游客2023-11-04  28
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答案                                 Sight
    Sight is very effective at giving exact information over considerable distances. / If the viewed object is moving, / it can tell us much about the speed and direction of this movement / as well as allow us to identify it. / For all this to happen we need to see it. / This means our eyes have to be looking in the correct direction. / Light waves do not go around objects very well, / so we cannot see an object if it is hidden behind another object. / This does put limits on what sight can achieve. / Sight is an easy sense to use, / because during the day we are surrounded by light supplied by the sun. / This light bounces off things and brings us information about them. / However, when the sun sets on a cloudy night, / the light is mostly gone, / and then vision shall become less useful as a sense.
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