vacant a.空的；未被占用的vacation n.假期,休假vacuum n.真空；真空吸尘器vague a.模糊的,含糊的vain a.徒劳的；自负的valid a.有效的；正当的valley n.(山)谷,溪谷；流域valuable a.值钱的；有价值的value n.价值...