He doesn't even have any accounts on social media, so I can't contact him that way, either. My mother still hasn't told me what was in the note that he left.

他在社交媒体上都没有账号 所以我也没法通过社交媒体联系到他 我妈妈还没告诉我他留下的纸条里写了什么。

And it means that the bottom of the drop is changing between different wavy shapes and no longer fully in contact with the oil the way it would be if it stayed as a perfectly circular drop.

就是说水滴底部正在变成各种波纹形状，而不再像保持完美圆形水滴那样与油完全接触了。