essential
n. 要素,要點,本質adj. 必要的,重要的,本質的 [an ~ part of the machine 那部機器不可缺的重要部分
; It is ~ that we (should) act quickly. = It is ~ for us to act quickly. 重要的是我們必須立刻行動
; Sleep and good food are ~ to health. 睡眠與良好食物對健康是必要的
; <<詞的變形>>:(more ~; most ~)
; ; ]
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