empty: suggests a complete absence of contents: an ~ bucket.
vacant: suggests an absence of appropriate contents or occupants: a ~ apartment. 又如vacant rooms/positions/lockers/seats/lot/smile/stare/look空房/职位/寄存柜/座位/一块土地/笑容/凝视/面容，来自词根VAC=empty，vacation是离开工作岗位学校住所而"空出来"的时间，如summer/winter/go on vacation寒/暑/度假
blank: stresses the lacking of any significant, relieving, or intelligible features on a surface: a ~ wall. （如a blank paper/application form/check/slate白纸/没有填写的申请表/空白支票(比喻全权决定)/白板(比喻没有知识经验)，fill in the blanks填空，my mind went blank when I heard the question听到问题后大脑一片空白，其中go blank=blank out表示突然全部忘记无法思考） feature 1、特征an interesting or important part or characteristic of something（某物的）有趣或重要的部分或特性 2、五官a part of someone's face, such as eyes and nose.
void: suggests absolute emptiness as far as the mind or senses can determine: a statement ~ of meaning. 如the contract was declared null and void被宣布无效(null等于0的having the value zero)，如he is void of charm没有魅力，如本例void of meaning没有意义
vacuous: suggests the emptiness of a vacuum and especially the lack of intelligence or significance: a ~ facial expression. 同样来自词根VAC， 注意真空拼写是2个u，之前错写成了2个c vacluous smile/facial expression/movie/comment空洞的笑容/面部表情/电影/评论
empty空的: 指完全无内容，vacant空置空闲: 指缺乏通常应有的住户或内容，blank空白: 指表面空白无特征，void空的无意义无效: 指思维、意义等方面，vacuous空洞: 同void，像真空一样缺乏智力意义
记忆方法: 1）首字母EVBVV想成BE VVV做大V<==空的 "空"本义是"孔穴"，其中的工仅表读音没有意义。引申指1、空间，如天空太空高空空运 2、没有内容，如空穴空洞空手空虚空心空谈 3、间隙，如空隙空闲有空空格钻空子填空空出来 4、徒然白白地，如空欢喜空忙乎空遗恨 佛教中表示"万物从因缘生，没有固定，虚幻不实"，如"色即是空"是说世间万物虚幻不定，悟空就是对此领悟，空还指佛教本身，如空门指佛门
2）练习一下
3）空的的意思是缺乏内容mean lacking contents which could or should be present.首字母EVBVV想成BE VVV做大V<==空的
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