essential

US /ɪˈsɛnʃəl/

UK /ɪ'senʃl/

B1 中級TOEIC
adj.形容詞絶不必要な : 不可欠な
It is essential that you write your name on your test paper
adj.形容詞根本的
The essential point is that we need to act now.
n.名詞精油
Lavender essential oil is known for its calming properties.

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