It means this tennis ball... while it is in free fall, it has no weight.

再比如说这个网球。,自由落体过程中它没有重量。

Cant not see anything above the Ad, It means this Ad is empty or can't preview.

以上为广告效果预览，如未看到任何内容，表明此广告为空或不可预览。

All the 6 genotypes (9 strains)of measles virus showed DNA positive strand, it means this RT-PCR method is sensitive for measles viruses.

结果9株6种基因型麻疹病毒RTPCR均呈现阳性条带，说明本研究采用的RTPCR方法敏感。

What It Means:This dream is a really good indication that you feel like you're missing out on an opportunity or what you really want in your career.

解梦：这种梦境实际上是一个好的提示，暗示在你的职业生涯中，你觉得自己正在错过某个机会或者你真正想要的东西。