“缺少的”的英语？

“缺少的”的拼音为：...

填出所缺少的单词，你就会赢得一件T恤。Supply the missing word(s) and you could win a T-shirt.新鲜空气对健康是不可缺少的.Fresh air is fundamental to good health.这些是不可缺少的附件.These are indispensable accessories....