卡片里面是空白的。

The inside of the card was blank.

youdao

你应该想一下办法制作属于你自己的卡片或买一张空白的，但必须写上一些你真正的内心感受或让收到的人觉得特别。

By all means make your own card or buy a blank one, but make sure that you actually write something heartfelt and make the person that you're giving it to feel special.

youdao

然而，保持卡片表面整洁保留多点空白位置更便于阅读。

However, it's important not to clutter your card and to leave plenty of white space, so it's easy to read.

youdao