Basically the simplest answer is that you need to measure a sufficient number of points so that you can uniquely describe the mode shape.

大致说来最简单的回答是，你需要测量足够多的点，这样你就可以唯一地描述模态振型了。

youdao

Maintain your "sales mode." act as a cordial guest. Listen, answer questions thoughtfully, and make eye contact with all participants. Smile and demonstrate your enthusiasm for the job.

保持你的“推销模式”。临时客串一把热情友好的销售员。倾听并考虑周到地回答问题，并与各位参与者做眼神交流。面带微笑并表露出你对这份工作的巨大热情。

youdao

Deployment does not occur in answer mode.

不会在应答模式下进行部署。

youdao

As the two biggest political parties answer to the same sorts of masters, during short piece of time that politicians are out of campaign mode and are actually governing, there is little difference in policy.

FORBES: Romney Versus Obama: Who Will Be Better for the Economy?