adj. 必要的;強制的;必然的;不可避免的;
n. 必需品;
?? necess必要 + ary 表示有...性質的, → a.必要的;必然的
"Vitamin D is necessary to aid the absorption of calcium from food."
從食物中吸取鈣需靠維生素D的幫助。
近義:indispensable, inevitable, mandatory, needful, obligatory, obliged
反義:needless, pointless, profitless, purposeless, redundant, reiterative
vt. 保持;保養;堅持;固執己見;
?? main手+tain拿→用手拿住→維持
"The idea is to maintain the regularity of the heartbeat."
問題就是要維持心跳的規律性.
近義:hold, husband, keep, prop, save, steady
n. 食物,食品;糧食;養料;資料;
"Vitamin D is necessary to aid the absorption of calcium from food."
從食物中吸取鈣需靠維生素D的幫助。
近義:meal, mess, nourishment, nutrient, nutriment, nutrition
n. 生活,生計;生命,性命;一生,壽命;人生,塵世;
"My life seemed aimless."
我的生活似乎沒有目標。
近義:being, existence, liveliness, spark, sprightliness, zest
反義:passing, quietus, decease, demise, disappearance, end