empty 指空无一人或一物，或空洞无意义的。
vacant 普通用词，侧重某物或某个位置没有被占用。
hollow 指物体中间是空的。
blank 指上面没有写字、印刷或做记号的空白表面，或指上面留着准备被填写的空白处。
open 指未被占有，从而可被别人得到的。
参考例句
1. He blanked an entry. 他删除了一个项目(或词条)。
2. Yes, there is a blank. 是的，其间有一段空白。
3. Password entered was blank. Please try again. 密码不能是空白，请再试一次。
英英解释
n.
1. a blank character used to separate successive words in writing or printing
2. a substitute for a taboo word
3. a blank gap or missing part
4. a piece of material ready to be made into something
5. a cartridge containing an explosive charge but no bullet v.
1. keep the opposing (baseball) team from winning
2. (of a surface) not written or printed on
3. void of expression
4. not charged with a bullet
