It is necessary for a student to concentrate in class. ... This book is an indispensable resource for researchers. ... Food and water are essential for life. ... <看更多>

necessary 和essential都是必要的意思最近在看工作文章時有時候是出現necessary 而有時候是essential 不知道這兩個字是否有程度上的差異或者只是說法/ ... ... <看更多>

Necessary Essentials | We love a bargain and like to provide others with the same. ... <看更多>

I need one word that could roughly describe or imply something as both (1) necessary/essential/fundamental/foundational and (2) not ... ... <看更多>

Have you ever wondered why aeroplanes have winglets at their end? Do those wing tips have any connection to the aerodynamics behind the ... ... <看更多>