When was the survey conducted:时间变化

The effectiveness of the result of the survey cited by the author as main evidence is also open to doubt.

The survey was conduct (during a special period, or a long time ago), thus may not reflect the current situations accurately. It is true that ( the survey may reflect the opinions or situations of respondents at the time when it was conducted), but people’s opinion toward (the subject surveyed) may have changed greatly during the past time (or, while this fact could not sufficiently illustrate that (the general group) will also...all the time)(many factors that could influence the validity of the survey will change in the future, or respondents may act differently during the period when the survey was conducted, thus the result of the survey could not represent the all-time situation. )

Thus, a more recent survey, if a survey is needed at all, should be provided to sufficiently illustrate the author’s assumption that...